diff --git a/.gitignore b/.gitignore
index 967fbb64cd87b93298c7f5c9c0a14061c4f75c96..75355960282c452ece1b7a7a20d1aff749da5408 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@
 /.idea/workspace.xml
 /.idea/libraries
 /.idea/codeStyles/
+.idea
 .DS_Store
 /build
 /captures
diff --git a/app/src/main/java/foundation/e/drive/operations/ListFileRemoteOperation.java b/app/src/main/java/foundation/e/drive/operations/ListFileRemoteOperation.java
index 8b52716c09fd4e561e632ca029f7502808acd268..b2912c513e8ea009ffed84c596187781bfc99313 100644
--- a/app/src/main/java/foundation/e/drive/operations/ListFileRemoteOperation.java
+++ b/app/src/main/java/foundation/e/drive/operations/ListFileRemoteOperation.java
@@ -155,6 +155,11 @@ public class ListFileRemoteOperation extends RemoteOperation {
                 Log.w(TAG, "LightReadFolderRemoteOperation failed : http " + result.getHttpCode() + ", " + result.getLogMessage()+" => Ignored");
             }
 
+            try {
+                Thread.sleep(150);
+            }catch(InterruptedException e){
+                Log.w(TAG, "listFileRemoteOperation's sleep had been interrupted");
+            }
         } //End of loop
         finalResult = new RemoteOperationResult(RemoteOperationResult.ResultCode.OK);
 
diff --git a/app/src/main/java/foundation/e/drive/services/ObserverService.java b/app/src/main/java/foundation/e/drive/services/ObserverService.java
index 6cf06395b6d618bfcecf7b6fd1dba227e20987ae..3f4e21636779d0ff8792af18a294084e38048a12 100644
--- a/app/src/main/java/foundation/e/drive/services/ObserverService.java
+++ b/app/src/main/java/foundation/e/drive/services/ObserverService.java
@@ -60,7 +60,7 @@ import foundation.e.drive.utils.ServiceExceptionHandler;
  */
 public class ObserverService extends Service implements OnRemoteOperationListener {
     private final static String TAG = ObserverService.class.getSimpleName();
-    private final static int INTERSYNC_MINIMUM_DELAY = 300000; // min delay between two sync in ms.
+    private final static int INTERSYNC_MINIMUM_DELAY = 900000; // min delay between two sync in ms.
 
     private List<SyncedFolder> mSyncedFolders; //List of synced folder
     private boolean isWorking = false;