diff --git a/app/src/main/kotlin/com/hippo/ehviewer/client/data/BaseGalleryInfo.kt b/app/src/main/kotlin/com/hippo/ehviewer/client/data/BaseGalleryInfo.kt
index 67390b0d3..18e632cc4 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/client/data/BaseGalleryInfo.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/client/data/BaseGalleryInfo.kt
@@ -23,6 +23,7 @@ import androidx.room.PrimaryKey
 import androidx.room.TypeConverter
 import androidx.room.TypeConverters
 import com.hippo.ehviewer.client.data.GalleryInfo.Companion.NOT_FAVORITED
+import kotlinx.parcelize.IgnoredOnParcel
 import kotlinx.parcelize.Parcelize
 import kotlinx.serialization.Serializable
 
@@ -90,6 +91,9 @@ data class BaseGalleryInfo(
     override var favoriteNote: String? = null,
 ) : GalleryInfo,
     Parcelable {
+    @IgnoredOnParcel
+    override val hasAds by lazy { simpleTags?.any { "extraneous ads" in it } == true }
+
     constructor() : this(0, "")
 }
 
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/client/data/GalleryInfo.kt b/app/src/main/kotlin/com/hippo/ehviewer/client/data/GalleryInfo.kt
index 6b9c5a854..cde4ed643 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/client/data/GalleryInfo.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/client/data/GalleryInfo.kt
@@ -37,6 +37,7 @@ interface GalleryInfo {
     var favoriteSlot: Int
     var favoriteName: String?
     var favoriteNote: String?
+    val hasAds: Boolean
 
     fun generateSLang() {
         simpleLanguage = simpleTags?.let { generateSLangFromTags(it) }
@@ -141,6 +142,3 @@ fun GalleryInfo.findBaseInfo(): BaseGalleryInfo = when (this) {
 }
 
 fun GalleryInfo.asGalleryDetail(): GalleryDetail? = this as? GalleryDetail
-
-val GalleryInfo.hasAds
-    get() = simpleTags?.any { "extraneous ads" in it } ?: false
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/client/data/GalleryPreview.kt b/app/src/main/kotlin/com/hippo/ehviewer/client/data/GalleryPreview.kt
index 1d142165b..9b3e20693 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/client/data/GalleryPreview.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/client/data/GalleryPreview.kt
@@ -18,7 +18,7 @@ package com.hippo.ehviewer.client.data
 import android.os.Parcelable
 import kotlinx.parcelize.Parcelize
 
-interface GalleryPreview : Parcelable {
+sealed interface GalleryPreview : Parcelable {
     val url: String
     val position: Int
 }
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/client/data/ListUrlBuilder.kt b/app/src/main/kotlin/com/hippo/ehviewer/client/data/ListUrlBuilder.kt
index 58603dbdb..deb3a4266 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/client/data/ListUrlBuilder.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/client/data/ListUrlBuilder.kt
@@ -16,7 +16,6 @@
 package com.hippo.ehviewer.client.data
 
 import android.os.Parcelable
-import androidx.annotation.IntDef
 import com.hippo.ehviewer.Settings
 import com.hippo.ehviewer.client.EhUrl
 import com.hippo.ehviewer.client.EhUtils
@@ -32,13 +31,12 @@ import kotlinx.parcelize.Parcelize
 
 @Parcelize
 data class ListUrlBuilder(
-    @get:Mode @Mode
     var mode: Int = MODE_NORMAL,
-    private var mPrev: String? = null,
-    var mNext: String? = null,
+    private var prev: String? = null,
+    var next: String? = null,
     // Reset to null after initial loading
-    var mJumpTo: String? = null,
-    private var mRange: Int = 0,
+    var jumpTo: String? = null,
+    private var range: Int = 0,
     var category: Int = EhUtils.NONE,
     private var mKeyword: String? = null,
     var hash: String? = null,
@@ -47,24 +45,23 @@ data class ListUrlBuilder(
     var minRating: Int = -1,
     var pageFrom: Int = -1,
     var pageTo: Int = -1,
-    var imagePath: String? = null,
 ) : Parcelable {
 
     fun setIndex(index: String, isNext: Boolean = true) {
-        mNext = index.takeIf { isNext }
-        mPrev = index.takeUnless { isNext }
-        mRange = 0
+        next = index.takeIf { isNext }
+        prev = index.takeUnless { isNext }
+        range = 0
     }
 
-    fun setJumpTo(jumpTo: Int) {
-        mJumpTo = jumpTo.takeUnless { it == 0 }?.toString()
+    fun setJumpTo(to: Int) {
+        jumpTo = to.takeUnless { it == 0 }?.toString()
     }
 
-    fun setRange(range: Int) {
-        mRange = range
-        mPrev = null
-        mNext = null
-        mJumpTo = null
+    fun setRange(to: Int) {
+        range = to
+        prev = null
+        next = null
+        jumpTo = null
     }
 
     var keyword: String?
@@ -81,7 +78,7 @@ data class ListUrlBuilder(
         minRating = q.minRating
         pageFrom = q.pageFrom
         pageTo = q.pageTo
-        mNext = q.name.substringAfterLast('@', "").ifEmpty { null }
+        next = q.name.substringAfterLast('@', "").ifEmpty { null }
     }
 
     fun toQuickSearch(name: String): QuickSearch = QuickSearch(
@@ -277,10 +274,10 @@ data class ListUrlBuilder(
                 }
             }
             addQueryParameterIfNotBlank("f_search", query)
-            addQueryParameterIfNotBlank("prev", mPrev)
-            addQueryParameterIfNotBlank("next", mNext)
-            addQueryParameterIfNotBlank("seek", mJumpTo)
-            addQueryParameterIfNotBlank("range", mRange.takeIf { it > 0 }?.toString())
+            addQueryParameterIfNotBlank("prev", prev)
+            addQueryParameterIfNotBlank("next", next)
+            addQueryParameterIfNotBlank("seek", jumpTo)
+            addQueryParameterIfNotBlank("range", range.takeIf { it > 0 }?.toString())
             // Advance search
             if (advanceSearch > 0 || minRating > 0 || pageFrom > 0 || pageTo > 0) {
                 addQueryParameter("advsearch", "1")
@@ -322,10 +319,10 @@ data class ListUrlBuilder(
         MODE_UPLOADER, MODE_TAG -> {
             val path = if (mode == MODE_UPLOADER) "uploader" else "tag"
             ehUrl(listOf(path, requireNotNull(mKeyword))) {
-                addQueryParameterIfNotBlank("prev", mPrev)
-                addQueryParameterIfNotBlank("next", mNext)
-                addQueryParameterIfNotBlank("seek", mJumpTo)
-                addQueryParameterIfNotBlank("range", mRange.takeIf { it > 0 }?.toString())
+                addQueryParameterIfNotBlank("prev", prev)
+                addQueryParameterIfNotBlank("next", next)
+                addQueryParameterIfNotBlank("seek", jumpTo)
+                addQueryParameterIfNotBlank("range", range.takeIf { it > 0 }?.toString())
             }.buildString()
         }
 
@@ -333,27 +330,14 @@ data class ListUrlBuilder(
         MODE_IMAGE_SEARCH -> ehUrl {
             addQueryParameter("f_shash", requireNotNull(hash))
         }.buildString()
-        MODE_TOPLIST -> {
-            ehUrl("toplist.php", EhUrl.DOMAIN_E) {
-                addQueryParameter("tl", requireNotNull(mKeyword))
-                addQueryParameterIfNotBlank("p", mJumpTo)
-            }.buildString()
-        }
+        MODE_TOPLIST -> ehUrl("toplist.php", EhUrl.DOMAIN_E) {
+            addQueryParameter("tl", requireNotNull(mKeyword))
+            addQueryParameterIfNotBlank("p", jumpTo)
+        }.buildString()
 
         else -> throw IllegalStateException("Unexpected value: $mode")
     }
 
-    @IntDef(
-        MODE_NORMAL,
-        MODE_UPLOADER,
-        MODE_TAG,
-        MODE_WHATS_HOT,
-        MODE_IMAGE_SEARCH,
-        MODE_SUBSCRIPTION,
-        MODE_TOPLIST,
-    )
-    @Retention(AnnotationRetention.SOURCE)
-    private annotation class Mode
     companion object {
         const val MODE_NORMAL = 0x0
         const val MODE_UPLOADER = 0x1
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/coil/Extensions.kt b/app/src/main/kotlin/com/hippo/ehviewer/coil/Extensions.kt
index 7ab263562..26e674168 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/coil/Extensions.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/coil/Extensions.kt
@@ -9,12 +9,16 @@ import coil3.network.NetworkHeaders
 import coil3.network.httpHeaders
 import coil3.request.CachePolicy
 import coil3.request.ImageRequest
+import coil3.request.allowHardware
 import coil3.size.Size
+import com.hippo.ehviewer.BuildConfig
 import com.hippo.ehviewer.Settings
 import com.hippo.ehviewer.client.CHROME_ACCEPT
 import com.hippo.ehviewer.client.CHROME_ACCEPT_LANGUAGE
+import com.hippo.ehviewer.client.data.GalleryDetail
 import com.hippo.ehviewer.client.data.GalleryInfo
 import com.hippo.ehviewer.client.data.GalleryPreview
+import com.hippo.ehviewer.client.data.LargeGalleryPreview
 import com.hippo.ehviewer.client.data.NormalGalleryPreview
 import com.hippo.ehviewer.client.imageKey
 import com.hippo.ehviewer.spider.DownloadInfoMagics.encodeMagicRequestOrUrl
@@ -34,11 +38,24 @@ fun ImageRequest.Builder.ehUrl(info: GalleryInfo) = apply {
     httpHeaders(header)
 }
 
-fun ImageRequest.Builder.ehPreview(preview: GalleryPreview) = apply {
-    data(preview.url)
-    memoryCacheKey(preview.imageKey)
-    diskCacheKey(preview.imageKey)
-    if (preview is NormalGalleryPreview) size(Size.ORIGINAL)
+context(GalleryDetail)
+fun ImageRequest.Builder.ehPreview(
+    preview: GalleryPreview,
+) = with(preview) {
+    data(url)
+    memoryCacheKey(imageKey)
+    diskCacheKey(imageKey)
+    when (preview) {
+        is NormalGalleryPreview -> size(Size.ORIGINAL)
+        is LargeGalleryPreview -> {
+            if (hasAds && detectAds(position, pages, BuildConfig.DEBUG)) {
+                size(Size.ORIGINAL)
+                detectQrCode(true)
+                allowHardware(false)
+                hardwareThreshold(0)
+            }
+        }
+    }
     httpHeaders(header)
 }
 
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/coil/QrCodeInterceptor.kt b/app/src/main/kotlin/com/hippo/ehviewer/coil/QrCodeInterceptor.kt
index 0e42ec20b..4571a5db4 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/coil/QrCodeInterceptor.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/coil/QrCodeInterceptor.kt
@@ -1,12 +1,18 @@
 package com.hippo.ehviewer.coil
 
+import androidx.collection.SieveCache
 import coil3.Extras
+import coil3.Image
 import coil3.getExtra
 import coil3.intercept.Interceptor
+import coil3.memory.MemoryCache
 import coil3.request.ImageRequest
 import coil3.request.ImageResult
 import coil3.request.SuccessResult
+import com.hippo.ehviewer.Settings
 import com.hippo.ehviewer.image.hasQrCode
+import eu.kanade.tachiyomi.util.system.logcat
+import moe.tarsin.coroutines.runSuspendCatching
 
 private val detectQrCodeKey = Extras.Key(default = false)
 
@@ -14,6 +20,8 @@ fun ImageRequest.Builder.detectQrCode(enable: Boolean) = apply {
     extras[detectQrCodeKey] = enable
 }
 
+private val lruCache = SieveCache<MemoryCache.Key, Boolean>(50)
+
 val ImageRequest.detectQrCode: Boolean
     get() = getExtra(detectQrCodeKey)
 
@@ -23,7 +31,11 @@ object QrCodeInterceptor : Interceptor {
         if (chain.request.detectQrCode && result is SuccessResult) {
             val image = result.image
             if (image is BitmapImageWithExtraInfo) {
-                val hasQrCode = hasQrCode(image.image.bitmap)
+                fun compute() = runSuspendCatching { hasQrCode(image.image.bitmap) }.onFailure { logcat(it) }.getOrThrow()
+                val hasQrCode = when (val key = result.memoryCacheKey) {
+                    is MemoryCache.Key -> lruCache[key] ?: compute().also { lruCache[key] = it }
+                    null -> compute()
+                }
                 val new = image.copy(hasQrCode = hasQrCode)
                 return result.copy(image = new)
             }
@@ -31,3 +43,11 @@ object QrCodeInterceptor : Interceptor {
         return result
     }
 }
+
+val Image.hasQrCode
+    get() = when (this) {
+        is BitmapImageWithExtraInfo -> hasQrCode
+        else -> false
+    }
+
+fun detectAds(index: Int, size: Int, enable: Boolean = true) = index > size - 10 && Settings.stripExtraneousAds.value && enable
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/gallery/ArchivePageLoader.kt b/app/src/main/kotlin/com/hippo/ehviewer/gallery/ArchivePageLoader.kt
index 4b1ebcc8f..d38535b7f 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/gallery/ArchivePageLoader.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/gallery/ArchivePageLoader.kt
@@ -16,8 +16,8 @@
 package com.hippo.ehviewer.gallery
 
 import android.os.ParcelFileDescriptor
-import com.hippo.ehviewer.Settings
 import com.hippo.ehviewer.Settings.archivePasswds
+import com.hippo.ehviewer.coil.detectAds
 import com.hippo.ehviewer.image.ByteBufferSource
 import com.hippo.ehviewer.image.Image
 import com.hippo.ehviewer.jni.closeArchive
@@ -73,7 +73,6 @@ class ArchivePageLoader(
     }
 
     override var size = 0
-        private set
 
     override fun start() {
         super.start()
@@ -87,17 +86,17 @@ class ArchivePageLoader(
         logcat(DEBUG_TAG) { "Close archive ${file.toUri().displayPath} successfully!" }
     }
 
-    private val mJobMap = hashMapOf<Int, Job>()
-    private val mWorkerMutex = NamedMutex<Int>()
-    private val mSemaphore = Semaphore(4)
+    private val jobs = hashMapOf<Int, Job>()
+    private val workerMutex = NamedMutex<Int>()
+    private val semaphore = Semaphore(4)
 
     override fun onRequest(index: Int) {
-        synchronized(mJobMap) {
-            val current = mJobMap[index]
+        synchronized(jobs) {
+            val current = jobs[index]
             if (current?.isActive != true) {
-                mJobMap[index] = launch {
-                    mWorkerMutex.withLock(index) {
-                        mSemaphore.withPermit {
+                jobs[index] = launch {
+                    workerMutex.withLock(index) {
+                        semaphore.withPermit {
                             doRealWork(index)
                         }
                     }
@@ -106,8 +105,6 @@ class ArchivePageLoader(
         }
     }
 
-    private fun mayBeAd(index: Int) = index > size - 10
-
     private suspend fun doRealWork(index: Int) {
         val buffer = extractToByteBuffer(index) ?: return notifyPageFailed(index, null)
         check(buffer.isDirect)
@@ -124,7 +121,7 @@ class ArchivePageLoader(
             src.close()
             throw it
         }
-        val image = Image.decode(src, hasAds && Settings.stripExtraneousAds.value && mayBeAd(index)) ?: return notifyPageFailed(index, null)
+        val image = Image.decode(src, hasAds && detectAds(index, size)) ?: return notifyPageFailed(index, null)
         runCatching {
             currentCoroutineContext().ensureActive()
         }.onFailure {
diff --git a/app/src/main/kotlin/eu/kanade/tachiyomi/ui/reader/loader/PageLoader.kt b/app/src/main/kotlin/com/hippo/ehviewer/gallery/PageLoader.kt
similarity index 94%
rename from app/src/main/kotlin/eu/kanade/tachiyomi/ui/reader/loader/PageLoader.kt
rename to app/src/main/kotlin/com/hippo/ehviewer/gallery/PageLoader.kt
index 1b790ea3a..918308089 100644
--- a/app/src/main/kotlin/eu/kanade/tachiyomi/ui/reader/loader/PageLoader.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/gallery/PageLoader.kt
@@ -1,12 +1,8 @@
-package eu.kanade.tachiyomi.ui.reader.loader
+package com.hippo.ehviewer.gallery
 
 import androidx.annotation.CallSuper
 import androidx.collection.lruCache
 import com.hippo.ehviewer.Settings
-import com.hippo.ehviewer.gallery.Page
-import com.hippo.ehviewer.gallery.PageStatus
-import com.hippo.ehviewer.gallery.reset
-import com.hippo.ehviewer.gallery.status
 import com.hippo.ehviewer.image.Image
 import com.hippo.ehviewer.util.OSUtils
 import com.hippo.ehviewer.util.isAtLeastO
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/gallery/PageLoader2.kt b/app/src/main/kotlin/com/hippo/ehviewer/gallery/PageLoader2.kt
index 0dca881c9..22466d533 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/gallery/PageLoader2.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/gallery/PageLoader2.kt
@@ -17,7 +17,6 @@ package com.hippo.ehviewer.gallery
 
 import com.hippo.ehviewer.EhDB
 import com.hippo.ehviewer.util.FileUtils
-import eu.kanade.tachiyomi.ui.reader.loader.PageLoader
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.CoroutineStart
 import kotlinx.coroutines.Dispatchers
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/image/Image.kt b/app/src/main/kotlin/com/hippo/ehviewer/image/Image.kt
index c39b6d5e5..1df8620b9 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/image/Image.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/image/Image.kt
@@ -37,6 +37,7 @@ import com.hippo.ehviewer.Settings
 import com.hippo.ehviewer.coil.BitmapImageWithExtraInfo
 import com.hippo.ehviewer.coil.detectQrCode
 import com.hippo.ehviewer.coil.hardwareThreshold
+import com.hippo.ehviewer.coil.hasQrCode
 import com.hippo.ehviewer.coil.maybeCropBorder
 import com.hippo.ehviewer.jni.isGif
 import com.hippo.ehviewer.jni.mmap
@@ -55,10 +56,7 @@ import splitties.init.appCtx
 class Image private constructor(image: CoilImage, private val src: ImageSource) {
     val intrinsicSize = with(image) { IntSize(width, height) }
     val allocationSize = image.size
-    val hasQrCode = when (image) {
-        is BitmapImageWithExtraInfo -> image.hasQrCode
-        else -> false
-    }
+    val hasQrCode = image.hasQrCode
 
     var innerImage: CoilImage? = when (image) {
         is BitmapImageWithExtraInfo -> image.image
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/ktbuilder/Coil.kt b/app/src/main/kotlin/com/hippo/ehviewer/ktbuilder/Coil.kt
index 7d534b31e..e8ba89747 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/ktbuilder/Coil.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/ktbuilder/Coil.kt
@@ -5,6 +5,7 @@ import coil3.ImageLoader
 import coil3.disk.DiskCache
 import coil3.imageLoader
 import coil3.request.ImageRequest
+import com.hippo.ehviewer.client.data.GalleryDetail
 import com.hippo.ehviewer.client.data.GalleryInfo
 import com.hippo.ehviewer.client.data.GalleryPreview
 import com.hippo.ehviewer.coil.ehPreview
@@ -12,6 +13,7 @@ import com.hippo.ehviewer.coil.ehUrl
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.launch
 
+context(GalleryDetail)
 inline fun Context.imageRequest(preview: GalleryPreview, builder: ImageRequest.Builder.() -> Unit = {}) = ImageRequest.Builder(this).ehPreview(preview).apply(builder).build()
 inline fun Context.imageRequest(info: GalleryInfo, builder: ImageRequest.Builder.() -> Unit = {}) = ImageRequest.Builder(this).ehUrl(info).apply(builder).build()
 inline fun Context.imageRequest(builder: ImageRequest.Builder.() -> Unit = {}) = ImageRequest.Builder(this).apply(builder).build()
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/spider/SpiderQueen.kt b/app/src/main/kotlin/com/hippo/ehviewer/spider/SpiderQueen.kt
index d32115d02..9e541cc0d 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/spider/SpiderQueen.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/spider/SpiderQueen.kt
@@ -17,8 +17,6 @@
 package com.hippo.ehviewer.spider
 
 import androidx.annotation.IntDef
-import androidx.collection.LongSparseArray
-import androidx.collection.set
 import arrow.core.partially1
 import com.hippo.ehviewer.R
 import com.hippo.ehviewer.Settings
@@ -28,7 +26,6 @@ import com.hippo.ehviewer.client.EhUrl.getGalleryDetailUrl
 import com.hippo.ehviewer.client.EhUrl.getGalleryMultiPageViewerUrl
 import com.hippo.ehviewer.client.EhUrl.referer
 import com.hippo.ehviewer.client.data.GalleryInfo
-import com.hippo.ehviewer.client.data.hasAds
 import com.hippo.ehviewer.client.ehRequest
 import com.hippo.ehviewer.client.exception.QuotaExceededException
 import com.hippo.ehviewer.client.fetchUsingAsText
@@ -37,6 +34,7 @@ import com.hippo.ehviewer.client.parser.GalleryDetailParser.parsePreviewList
 import com.hippo.ehviewer.client.parser.GalleryDetailParser.parsePreviewPages
 import com.hippo.ehviewer.client.parser.GalleryMultiPageViewerPTokenParser
 import com.hippo.ehviewer.client.parser.GalleryPageUrlParser
+import com.hippo.ehviewer.coil.detectAds
 import com.hippo.ehviewer.image.Image
 import com.hippo.ehviewer.util.displayString
 import com.hippo.files.find
@@ -473,11 +471,11 @@ class SpiderQueen private constructor(val galleryInfo: GalleryInfo) : CoroutineS
         const val STATE_FINISHED = 2
         const val STATE_FAILED = 3
         const val SPIDER_INFO_FILENAME = ".ehviewer"
-        private val sQueenMap = LongSparseArray<SpiderQueen>()
+        private val sQueenMap = mutableMapOf<Long, SpiderQueen>()
 
         fun obtainSpiderQueen(galleryInfo: GalleryInfo, @Mode mode: Int): SpiderQueen {
             val gid = galleryInfo.gid
-            return (sQueenMap[gid] ?: SpiderQueen(galleryInfo).also { sQueenMap[gid] = it }).apply {
+            return (sQueenMap.getOrPut(gid) { SpiderQueen(galleryInfo) }).apply {
                 setMode(mode)
                 launch { updateMode() }
             }
@@ -740,13 +738,11 @@ class SpiderQueen private constructor(val galleryInfo: GalleryInfo) : CoroutineS
                 }
             }
 
-            private fun mayBeAd(index: Int) = index > size - 10
-
             private val hasAds = galleryInfo.hasAds
 
             private suspend fun doInJob(index: Int) {
                 val src = mSpiderDen.getImageSource(index) ?: return
-                val image = Image.decode(src, hasAds && Settings.stripExtraneousAds.value && mayBeAd(index))
+                val image = Image.decode(src, hasAds && detectAds(index, size))
                 checkNotNull(image)
                 runCatching {
                     currentCoroutineContext().ensureActive()
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/ui/main/GalleryPreview.kt b/app/src/main/kotlin/com/hippo/ehviewer/ui/main/GalleryPreview.kt
index 18b2246df..35c6c998a 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/ui/main/GalleryPreview.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/ui/main/GalleryPreview.kt
@@ -10,6 +10,7 @@ import androidx.compose.runtime.NonRestartableComposable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -23,12 +24,16 @@ import coil3.BitmapImage
 import coil3.compose.AsyncImage
 import coil3.compose.AsyncImagePainter
 import coil3.request.ImageRequest
+import com.hippo.ehviewer.client.data.GalleryDetail
 import com.hippo.ehviewer.client.data.GalleryPreview
 import com.hippo.ehviewer.client.data.NormalGalleryPreview
+import com.hippo.ehviewer.coil.hasQrCode
 import com.hippo.ehviewer.ktbuilder.imageRequest
+import com.hippo.ehviewer.ui.reader.AdsPlaceholder
 import com.hippo.ehviewer.ui.tools.CrystalCard
 import com.hippo.ehviewer.ui.tools.shouldCrop
 
+context(GalleryDetail)
 @Composable
 @NonRestartableComposable
 fun requestOf(model: GalleryPreview): ImageRequest {
@@ -36,50 +41,60 @@ fun requestOf(model: GalleryPreview): ImageRequest {
     return remember(model) { context.imageRequest(model) }
 }
 
+context(GalleryDetail)
 @Composable
 fun EhAsyncPreview(
     model: GalleryPreview,
     modifier: Modifier = Modifier,
 ) {
     var contentScale by remember(model) { mutableStateOf(ContentScale.Fit) }
-    AsyncImage(
-        model = requestOf(model),
-        contentDescription = null,
-        modifier = modifier,
-        transform = {
-            model.run {
-                if (it is AsyncImagePainter.State.Success && this is NormalGalleryPreview) {
-                    it.copy(
-                        painter = BitmapPainter(
-                            (it.result.image as BitmapImage).bitmap.asImageBitmap(),
-                            IntOffset(offsetX, 0),
-                            IntSize(clipWidth - 1, clipHeight - 1),
-                        ),
-                    )
-                } else {
-                    it
+    var blocked by rememberSaveable(model) { mutableStateOf(false) }
+    if (blocked) {
+        AdsPlaceholder(
+            modifier = modifier,
+            contentScale = ContentScale.Fit,
+        )
+    } else {
+        AsyncImage(
+            model = requestOf(model),
+            contentDescription = null,
+            modifier = modifier,
+            transform = {
+                with(model) {
+                    when (it) {
+                        is AsyncImagePainter.State.Success if it.result.image.hasQrCode -> it.also { blocked = true }
+                        is AsyncImagePainter.State.Success if this is NormalGalleryPreview -> it.copy(
+                            painter = BitmapPainter(
+                                (it.result.image as BitmapImage).bitmap.asImageBitmap(),
+                                IntOffset(offsetX, 0),
+                                IntSize(clipWidth - 1, clipHeight - 1),
+                            ),
+                        )
+                        else -> it
+                    }
                 }
-            }
-        },
-        onState = {
-            if (it is AsyncImagePainter.State.Success) {
-                model.run {
-                    if (this is NormalGalleryPreview) {
-                        if (shouldCrop) {
-                            contentScale = ContentScale.Crop
-                        }
-                    } else {
-                        if (it.result.image.shouldCrop) {
-                            contentScale = ContentScale.Crop
+            },
+            onState = {
+                if (it is AsyncImagePainter.State.Success) {
+                    with(model) {
+                        if (this is NormalGalleryPreview) {
+                            if (shouldCrop) {
+                                contentScale = ContentScale.Crop
+                            }
+                        } else {
+                            if (it.result.image.shouldCrop) {
+                                contentScale = ContentScale.Crop
+                            }
                         }
                     }
                 }
-            }
-        },
-        contentScale = contentScale,
-    )
+            },
+            contentScale = contentScale,
+        )
+    }
 }
 
+context(GalleryDetail)
 @Composable
 @NonRestartableComposable
 fun EhPreviewItem(
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/ui/reader/PagerItem.kt b/app/src/main/kotlin/com/hippo/ehviewer/ui/reader/PagerItem.kt
index d69289703..cd60d15b5 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/ui/reader/PagerItem.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/ui/reader/PagerItem.kt
@@ -35,12 +35,12 @@ import com.hippo.ehviewer.R
 import com.hippo.ehviewer.Settings
 import com.hippo.ehviewer.collectAsState
 import com.hippo.ehviewer.gallery.Page
+import com.hippo.ehviewer.gallery.PageLoader
 import com.hippo.ehviewer.gallery.PageStatus
 import com.hippo.ehviewer.gallery.progressObserved
 import com.hippo.ehviewer.gallery.statusObserved
 import com.hippo.ehviewer.image.Image
 import com.hippo.ehviewer.ui.settings.AdsPlaceholderFile
-import eu.kanade.tachiyomi.ui.reader.loader.PageLoader
 import eu.kanade.tachiyomi.ui.reader.viewer.CombinedCircularProgressIndicator
 import kotlinx.coroutines.flow.drop
 import moe.tarsin.kt.unreachable
@@ -101,26 +101,10 @@ fun PagerItem(
             )
         }
         is PageStatus.Blocked -> {
-            SubcomposeAsyncImage(
-                model = AdsPlaceholderFile,
-                contentDescription = null,
+            AdsPlaceholder(
                 modifier = modifier.fillMaxSize(),
                 contentScale = if (contentScale == ContentScale.Inside) ContentScale.Fit else contentScale,
-            ) {
-                val placeholderState by painter.state.collectAsState()
-                if (placeholderState is AsyncImagePainter.State.Success) {
-                    SubcomposeAsyncImageContent()
-                } else {
-                    Box(
-                        modifier = Modifier.fillMaxWidth().aspectRatio(DEFAULT_ASPECT),
-                        contentAlignment = Alignment.Center,
-                    ) {
-                        if (placeholderState is AsyncImagePainter.State.Error) {
-                            Text(text = stringResource(id = R.string.blocked_image))
-                        }
-                    }
-                }
-            }
+            )
         }
         is PageStatus.Error -> {
             Box(modifier = modifier.fillMaxWidth().aspectRatio(DEFAULT_ASPECT)) {
@@ -168,3 +152,28 @@ private val grayScaleAndInvertMatrix = ColorMatrix().also { mtx ->
 private val grayScaleFilter = ColorFilter.colorMatrix(grayScaleMatrix)
 private val invertFilter = ColorFilter.colorMatrix(invertMatrix)
 private val grayScaleAndInvertFilter = ColorFilter.colorMatrix(grayScaleAndInvertMatrix)
+
+@Composable
+fun AdsPlaceholder(
+    modifier: Modifier = Modifier,
+    contentScale: ContentScale,
+) = SubcomposeAsyncImage(
+    model = AdsPlaceholderFile,
+    contentDescription = null,
+    modifier = modifier,
+    contentScale = contentScale,
+) {
+    val placeholderState by painter.state.collectAsState()
+    if (placeholderState is AsyncImagePainter.State.Success) {
+        SubcomposeAsyncImageContent()
+    } else {
+        Box(
+            modifier = Modifier.fillMaxWidth().aspectRatio(DEFAULT_ASPECT),
+            contentAlignment = Alignment.Center,
+        ) {
+            if (placeholderState is AsyncImagePainter.State.Error) {
+                Text(text = stringResource(id = R.string.blocked_image))
+            }
+        }
+    }
+}
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/ui/reader/ReaderScreen.kt b/app/src/main/kotlin/com/hippo/ehviewer/ui/reader/ReaderScreen.kt
index eb7baa4a5..478092188 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/ui/reader/ReaderScreen.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/ui/reader/ReaderScreen.kt
@@ -54,7 +54,6 @@ import com.google.accompanist.systemuicontroller.rememberSystemUiController
 import com.hippo.ehviewer.R
 import com.hippo.ehviewer.Settings
 import com.hippo.ehviewer.client.data.BaseGalleryInfo
-import com.hippo.ehviewer.client.data.hasAds
 import com.hippo.ehviewer.collectAsState
 import com.hippo.ehviewer.download.DownloadManager
 import com.hippo.ehviewer.download.archiveFile
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/ui/screen/GalleryDetailContent.kt b/app/src/main/kotlin/com/hippo/ehviewer/ui/screen/GalleryDetailContent.kt
index 943cd0c53..36073878c 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/ui/screen/GalleryDetailContent.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/ui/screen/GalleryDetailContent.kt
@@ -747,8 +747,10 @@ private fun List<GalleryTagGroup>.getArtistTag(): String? {
     return null
 }
 
+typealias Previews = Pair<GalleryDetail, LazyPagingItems<GalleryPreview>>
+
 @Composable
-private fun Context.collectPreviewItems(detail: GalleryDetail, prefetchDistance: Int) = rememberInVM {
+private fun Context.collectPreviewItems(detail: GalleryDetail, prefetchDistance: Int) = rememberInVM(detail) {
     val pageSize = detail.previewList.size
     val pages = detail.pages
     val previewPagesMap = detail.previewList.associateBy { it.position } as MutableMap
@@ -787,15 +789,18 @@ private fun Context.collectPreviewItems(detail: GalleryDetail, prefetchDistance:
             override val jumpingSupported = true
         }
     }.flow.cachedIn(viewModelScope)
-}.collectAsLazyPagingItems()
+}.collectAsLazyPagingItems().let { remember(detail, it) { detail to it } }
 
-private fun LazyGridScope.galleryPreview(data: LazyPagingItems<GalleryPreview>, onClick: (Int) -> Unit) {
+private fun LazyGridScope.galleryPreview(previews: Previews, onClick: (Int) -> Unit) {
+    val (detail, data) = previews
     items(
         count = data.itemCount,
         key = data.itemKey(key = { item -> item.position }),
         contentType = { "preview" },
     ) { index ->
         val item = data[index]
-        EhPreviewItem(item, index) { onClick(index) }
+        with(detail) {
+            EhPreviewItem(item, index) { onClick(index) }
+        }
     }
 }
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/ui/screen/GalleryDetailScreen.kt b/app/src/main/kotlin/com/hippo/ehviewer/ui/screen/GalleryDetailScreen.kt
index 077e67a5c..5a30bd3f0 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/ui/screen/GalleryDetailScreen.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/ui/screen/GalleryDetailScreen.kt
@@ -150,8 +150,10 @@ fun AnimatedVisibilityScope.GalleryDetailScreen(args: GalleryDetailScreenArgs, n
                     galleryDetailCache.put(galleryDetail.gid, galleryDetail)
                     if (Settings.preloadThumbAggressively) {
                         launchIO {
-                            galleryDetail.previewList.forEach {
-                                imageLoader.enqueue(imageRequest(it) { justDownload() })
+                            with(galleryDetail) {
+                                previewList.forEach {
+                                    imageLoader.enqueue(imageRequest(it) { justDownload() })
+                                }
                             }
                         }
                     }
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/ui/screen/GalleryListScreen.kt b/app/src/main/kotlin/com/hippo/ehviewer/ui/screen/GalleryListScreen.kt
index 93a43de92..c194a1570 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/ui/screen/GalleryListScreen.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/ui/screen/GalleryListScreen.kt
@@ -221,7 +221,7 @@ fun AnimatedVisibilityScope.GalleryListScreen(lub: ListUrlBuilder, navigator: De
                 override suspend fun load(params: LoadParams<String>) = withIOContext {
                     if (urlBuilder.mode == MODE_TOPLIST) {
                         // TODO: Since we know total pages, let pager support jump
-                        val key = (params.key ?: urlBuilder.mJumpTo)?.toInt() ?: 0
+                        val key = (params.key ?: urlBuilder.jumpTo)?.toInt() ?: 0
                         val prev = (key - 1).takeIf { it > 0 }
                         val next = (key + 1).takeIf { it < TOPLIST_PAGES }
                         runSuspendCatching {
@@ -237,8 +237,8 @@ fun AnimatedVisibilityScope.GalleryListScreen(lub: ListUrlBuilder, navigator: De
                             is LoadParams.Refresh -> {
                                 val key = params.key
                                 if (key.isNullOrBlank()) {
-                                    if (urlBuilder.mJumpTo != null) {
-                                        urlBuilder.mNext ?: urlBuilder.setIndex("2", true)
+                                    if (urlBuilder.jumpTo != null) {
+                                        urlBuilder.next ?: urlBuilder.setIndex("2", true)
                                     }
                                 } else {
                                     urlBuilder.setIndex(key, false)
@@ -249,7 +249,7 @@ fun AnimatedVisibilityScope.GalleryListScreen(lub: ListUrlBuilder, navigator: De
                             val url = urlBuilder.build()
                             EhEngine.getGalleryList(url)
                         }.foldToLoadResult { result ->
-                            urlBuilder.mJumpTo = null
+                            urlBuilder.jumpTo = null
                             LoadResult.Page(result.galleryInfoList, result.prev, result.next)
                         }
                     }
@@ -736,7 +736,7 @@ fun AnimatedVisibilityScope.GalleryListScreen(lub: ListUrlBuilder, navigator: De
         if (urlBuilder.mode != MODE_WHATS_HOT) {
             onClick(EhIcons.Default.GoTo) {
                 if (isTopList) {
-                    val page = urlBuilder.mJumpTo?.toIntOrNull() ?: 0
+                    val page = urlBuilder.jumpTo?.toIntOrNull() ?: 0
                     val hint = getString(R.string.go_to_hint, page + 1, TOPLIST_PAGES)
                     val text = awaitInputText(title = gotoTitle, hint = hint, isNumber = true) { oriText ->
                         val goto = ensureNotNull(oriText.trim().toIntOrNull()) { invalidNum } - 1
@@ -745,7 +745,7 @@ fun AnimatedVisibilityScope.GalleryListScreen(lub: ListUrlBuilder, navigator: De
                     urlBuilder.setJumpTo(text)
                 } else {
                     val date = awaitSelectDate()
-                    urlBuilder.mJumpTo = date
+                    urlBuilder.jumpTo = date
                 }
                 data.refresh()
             }
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/ui/tools/RememberGlobally.kt b/app/src/main/kotlin/com/hippo/ehviewer/ui/tools/RememberGlobally.kt
index 6eaa988cc..a5e9afd32 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/ui/tools/RememberGlobally.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/ui/tools/RememberGlobally.kt
@@ -46,7 +46,7 @@ inline fun <reified T : Any> rememberInVM(
 ) = with(viewModel<StateMapViewModel>()) {
     val key = currentCompositeKeyHash
     remember(*inputs) {
-        val states = statesMap[key] ?: ArrayDeque<Any>().also { statesMap[key] = it }
+        val states = statesMap.getOrPut(key) { ArrayDeque() }
         states.removeLastOrNull() as T? ?: init()
     }.also { value ->
         val valueState by rememberUpdatedState(value)
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index b0c1690ae..f1969e35a 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -91,7 +91,7 @@ jsoup = "org.jsoup:jsoup:1.18.1"
 kotlinx-coroutines-android = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-android", version.ref = "kotlinx-coroutines" }
 kotlinx-datetime = { module = "org.jetbrains.kotlinx:kotlinx-datetime", version.ref = "kotlinx-datetime" }
 
-ktlint = "com.pinterest:ktlint:1.3.0"
+ktlint = "com.pinterest:ktlint:1.4.0-kotlin-dev-20240924.151646-39"
 
 ktor-client-core = { module = "io.ktor:ktor-client-core", version.ref = "ktor" }
 
diff --git a/settings.gradle.kts b/settings.gradle.kts
index c821e2278..d012017a2 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -11,6 +11,7 @@ dependencyResolutionManagement {
     repositories {
         google()
         mavenCentral()
+        maven("https://oss.sonatype.org/content/repositories/snapshots")
     }
 }