i dont know why i was doing this inside the for loop... It did not scale well !

fixed

src/UI/Movies/Editor/MovieEditorFooterView.js

@@ -107,11 +107,11 @@ module.exports = Marionette.ItemView.extend({
             }
             model.edited = true;
         });
-		for (var j=0; j<i; j++) {
         var filterKey = this.moviesCollection.state.filterKey;
         var filterValue = this.moviesCollection.state.filterValue;
         this.moviesCollection.setFilterMode('all');
 		//this.moviesCollection.fullCollection.resetFiltered();
+		for (var j=0; j<i; j++) {
 				var m = this.moviesCollection.fullCollection.findWhere({ tmdbId : b[j] });
 				if (m!== undefined) {
       			if (monitored === 'true') {
@@ -137,13 +137,12 @@ module.exports = Marionette.ItemView.extend({
                 if (rootFolder !== 'noChange') {
                 	var rootFolderPath = RootFolders.get(parseInt(rootFolder, 10));
                 	m.set('rootFolderPath', rootFolderPath.get('path'));
+            	}
+			}
 		}
 		this.moviesCollection.state.filterKey = filterKey;
         this.moviesCollection.state.filterValue = filterValue;
         this.moviesCollection.fullCollection.resetFiltered();
-			}
-		}	
-
 
 		FullMovieCollection.save();
     },