diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionBottomPresenter.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionBottomPresenter.kt
index a52d4a9d47..5b98e737e6 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionBottomPresenter.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionBottomPresenter.kt
@@ -1,6 +1,7 @@
 package eu.kanade.tachiyomi.ui.extension
 
 import android.content.pm.PackageInstaller
+import android.widget.Toast
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.database.DatabaseHelper
 import eu.kanade.tachiyomi.data.database.models.Manga
@@ -18,7 +19,9 @@ import eu.kanade.tachiyomi.ui.migration.MangaItem
 import eu.kanade.tachiyomi.ui.migration.SelectionHeader
 import eu.kanade.tachiyomi.ui.migration.SourceItem
 import eu.kanade.tachiyomi.util.system.LocaleHelper
+import eu.kanade.tachiyomi.util.system.MiuiUtil
 import eu.kanade.tachiyomi.util.system.executeOnIO
+import eu.kanade.tachiyomi.util.system.toast
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.async
 import kotlinx.coroutines.awaitAll
@@ -241,11 +244,23 @@ class ExtensionBottomPresenter(
     }
 
     fun installExtension(extension: Extension.Available) {
-        extensionManager.installExtension(extension).subscribeToInstallUpdate(extension)
+        if (isNotMIUIOptimized()) {
+            extensionManager.installExtension(extension).subscribeToInstallUpdate(extension)
+        }
     }
 
     fun updateExtension(extension: Extension.Installed) {
-        extensionManager.updateExtension(extension).subscribeToInstallUpdate(extension)
+        if (isNotMIUIOptimized()) {
+            extensionManager.updateExtension(extension).subscribeToInstallUpdate(extension)
+        }
+    }
+
+    fun isNotMIUIOptimized(): Boolean {
+        if (MiuiUtil.isMiui() && !MiuiUtil.isMiuiOptimizationDisabled()) {
+            preferences.context.toast(R.string.extensions_miui_warning, Toast.LENGTH_LONG)
+            return false
+        }
+        return true
     }
 
     private fun Observable<ExtensionIntallInfo>.subscribeToInstallUpdate(extension: Extension) {
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index dfe4071c8e..09bf41f636 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -303,6 +303,7 @@
     <string name="language_">Language: %1$s</string>
     <string name="nsfw_short">18+</string>
     <string name="unofficial">Unofficial</string>
+    <string name="extensions_miui_warning">MIUI Optimization must be disabled to install extensions.</string>
     <string name="may_contain_nsfw">May contain NSFW (18+) content</string>
     <string name="app_info">App info</string>
     <string name="_must_be_enabled_first">%1$s must be enabled first</string>