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src/VisualStudio/Core/Def/Implementation/DesignerAttribute/VisualStudioDesignerAttributeService.cs

@@ -107,6 +107,10 @@ private async Task StartAsync(CancellationToken cancellationToken)
 
         private async Task StartWorkerAsync(CancellationToken cancellationToken)
         {
+            // Set a short batch time so we update VS in a timely manner.  We still want to batch things up though as we
+            // might receive many notifications about files in a project, and it would be better to notify VS of them
+            // all at once rather than saturating the UI work queue with a lot of work that keeps being processed in
+            // between everything else that is going on.
             _workQueue = new AsyncBatchingWorkQueue<DesignerAttributeData>(
                 TimeSpan.FromMilliseconds(250),
                 this.NotifyProjectSystemAsync,