diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/ChapterLoader.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/ChapterLoader.kt
index d53bcd4b1..9300f2d50 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/ChapterLoader.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/ChapterLoader.kt
@@ -7,9 +7,13 @@ import eu.kanade.tachiyomi.data.download.DownloadProvider
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.online.HttpSource
 import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
+import eu.kanade.tachiyomi.util.system.toast
+import kotlinx.coroutines.DelicateCoroutinesApi
+import kotlinx.coroutines.GlobalScope
 import org.apache.commons.compress.archivers.dump.UnsupportedCompressionAlgorithmException
 import tachiyomi.core.i18n.stringResource
 import tachiyomi.core.storage.UniFileTempFileManager
+import tachiyomi.core.util.lang.launchUI
 import tachiyomi.core.util.lang.withIOContext
 import tachiyomi.core.util.system.logcat
 import tachiyomi.domain.manga.model.Manga
@@ -77,6 +81,7 @@ class ChapterLoader(
     /**
      * Returns the page loader to use for this [chapter].
      */
+    @OptIn(DelicateCoroutinesApi::class)
     private fun getPageLoader(chapter: ReaderChapter): PageLoader {
         val dbChapter = chapter.chapter
         val isDownloaded = downloadManager.isChapterDownloaded(
@@ -101,8 +106,13 @@ class ChapterLoader(
                     is Format.Zip -> ZipPageLoader(tempFileManager.createTempFile(format.file))
                     is Format.SevenZip -> try {
                         SevenZipPageLoader(tempFileManager.createTempFile(format.file))
+                        {
+                            GlobalScope.launchUI{
+                                context.toast(context.stringResource(MR.strings.loader_7zip_slow_archives, it))
+                            }
+                        }
                     } catch (e: UnsupportedCompressionAlgorithmException) {
-                        error(context.stringResource(MR.strings.loader_ppmd_error))
+                        error(context.stringResource(MR.strings.loader_7zip_ppmd_error))
                     }
                     is Format.Rar -> try {
                         RarPageLoader(tempFileManager.createTempFile(format.file))
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/SevenZipPageLoader.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/SevenZipPageLoader.kt
index 9e4ca829a..cba928eed 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/SevenZipPageLoader.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/SevenZipPageLoader.kt
@@ -9,14 +9,17 @@ import java.io.File
 /**
  * Loader used to load a chapter from a .7z or .cb7 file.
  */
-internal class SevenZipPageLoader(file: File) : PageLoader() {
+internal class SevenZipPageLoader(
+    private val file: File,
+    private val notifySlowArchive: (method: String) -> Unit
+) : PageLoader() {
 
     private val zip by lazy { SevenZFile(file) }
 
     override var isLocal: Boolean = true
 
     override suspend fun getPages(): List<ReaderPage> {
-        return zip.getImages()
+        return zip.getImages(notifySlowArchive)
             .mapIndexed { i, entry ->
                 ReaderPage(i).apply {
                     stream = { entry.copyOf().inputStream() }
diff --git a/core/src/main/java/eu/kanade/tachiyomi/util/storage/SevenZUtil.kt b/core/src/main/java/eu/kanade/tachiyomi/util/storage/SevenZUtil.kt
index 6e5d55ef2..19c133e25 100644
--- a/core/src/main/java/eu/kanade/tachiyomi/util/storage/SevenZUtil.kt
+++ b/core/src/main/java/eu/kanade/tachiyomi/util/storage/SevenZUtil.kt
@@ -3,12 +3,19 @@ package eu.kanade.tachiyomi.util.storage
 import eu.kanade.tachiyomi.util.lang.compareToCaseInsensitiveNaturalOrder
 import org.apache.commons.compress.archivers.dump.UnsupportedCompressionAlgorithmException
 import org.apache.commons.compress.archivers.sevenz.SevenZFile
+import org.apache.commons.compress.archivers.sevenz.SevenZMethod
 import tachiyomi.core.util.system.ImageUtil
 import java.io.IOException
 import java.io.InputStream
 
 object SevenZUtil {
-    fun SevenZFile.getImages(): Sequence<ByteArray> {
+    private val GoodMethods = arrayOf(
+        SevenZMethod.LZMA2,
+        SevenZMethod.DEFLATE,
+        SevenZMethod.COPY,
+    )
+
+    fun SevenZFile.getImages(notifySlowArchives: (method: String) -> Unit): Sequence<ByteArray> {
         return generateSequence {
             try {
                 getNextEntry()
@@ -16,6 +23,11 @@ object SevenZUtil {
                 throw UnsupportedCompressionAlgorithmException()
             }
         }.filter { !it.isDirectory && ImageUtil.isImage(it.name) { getInputStream(it) } }
+            .onEachIndexed { i, it ->
+                if (i > 0) return@onEachIndexed
+                val method = it.contentMethods.first().method
+                if(method !in GoodMethods) notifySlowArchives(method.name)
+            }
             .sortedWith { f1, f2 -> f1.name.compareToCaseInsensitiveNaturalOrder(f2.name) }
             .map(::getInputStream)
             .map { it.use(InputStream::readBytes) } // ByteArray
diff --git a/i18n/src/commonMain/resources/MR/base/strings.xml b/i18n/src/commonMain/resources/MR/base/strings.xml
index 155340fb1..8efc44c9a 100644
--- a/i18n/src/commonMain/resources/MR/base/strings.xml
+++ b/i18n/src/commonMain/resources/MR/base/strings.xml
@@ -776,7 +776,8 @@
     <string name="page_list_empty_error">No pages found</string>
     <string name="loader_not_implemented_error">Source not found</string>
     <string name="loader_rar5_error">RARv5 format is not supported</string>
-    <string name="loader_ppmd_error">PPMd compression is not supported</string>
+    <string name="loader_7zip_ppmd_error">PPMd compression is not supported</string>
+    <string name="loader_7zip_slow_archives">%s Archive, expect slow loading times.</string>
 
     <!-- Updates -->
     <string name="updating_library">Updating library</string>
diff --git a/source-local/src/androidMain/kotlin/tachiyomi/source/local/LocalSource.kt b/source-local/src/androidMain/kotlin/tachiyomi/source/local/LocalSource.kt
index 5435c86c8..332de763b 100644
--- a/source-local/src/androidMain/kotlin/tachiyomi/source/local/LocalSource.kt
+++ b/source-local/src/androidMain/kotlin/tachiyomi/source/local/LocalSource.kt
@@ -344,7 +344,7 @@ actual class LocalSource(
                 }
                 is Format.SevenZip -> {
                     SevenZFile(tempFileManager.createTempFile(format.file)).use { archive ->
-                        val entry = archive.getImages().firstOrNull()
+                        val entry = archive.getImages {} .firstOrNull()
 
                         entry?.let { coverManager.update(manga, it.inputStream()) }
                     }