diff --git a/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt b/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt
index fc096de5f..938424fe2 100644
--- a/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt
@@ -50,7 +50,6 @@ class ChangeSourceViewModel(application: Application) : BaseViewModel(applicatio
         execute {
             val bookSourceList = App.db.bookSourceDao().allEnabled
             for (item in bookSourceList) {
-                delay(100)
                 //task取消时自动取消 by （scope = this@execute）
                 WebBook(item).searchBook(name, scope = this@execute)
                     .timeout(30000L)
@@ -68,6 +67,7 @@ class ChangeSourceViewModel(application: Application) : BaseViewModel(applicatio
                             }
                         }
                     }
+                delay(100)
             }
         }
     }
diff --git a/app/src/main/java/io/legado/app/ui/main/bookshelf/BookshelfViewModel.kt b/app/src/main/java/io/legado/app/ui/main/bookshelf/BookshelfViewModel.kt
index 451b6443f..0accc1813 100644
--- a/app/src/main/java/io/legado/app/ui/main/bookshelf/BookshelfViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/main/bookshelf/BookshelfViewModel.kt
@@ -9,6 +9,7 @@ import io.legado.app.data.entities.BookGroup
 import io.legado.app.model.WebBook
 import io.legado.app.utils.postEvent
 import kotlinx.coroutines.Dispatchers.IO
+import kotlinx.coroutines.delay
 
 class BookshelfViewModel(application: Application) : BaseViewModel(application) {
 
@@ -48,6 +49,7 @@ class BookshelfViewModel(application: Application) : BaseViewModel(application)
                         }
                     }
                 }
+                delay(50)
             }
         }
     }
diff --git a/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt b/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt
index 33381933b..0fbb8c772 100644
--- a/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt
@@ -29,7 +29,6 @@ class SearchViewModel(application: Application) : BaseViewModel(application) {
             //onCleared时自动取消
             val bookSourceList = App.db.bookSourceDao().allEnabled
             for (item in bookSourceList) {
-                delay(100)//每隔100毫秒搜索一个书源
                 //task取消时自动取消 by （scope = this@execute）
                 WebBook(item).searchBook(key, searchPage, scope = this@execute)
                     .timeout(30000L)
@@ -41,6 +40,7 @@ class SearchViewModel(application: Application) : BaseViewModel(application) {
                             }
                         }
                     }
+                delay(100)//每隔100毫秒搜索一个书源
             }
         }.onError {
             it.printStackTrace()