diff --git a/src/VisualStudio/Core/Def/Implementation/ProjectSystem/VisualStudioProjectTracker.cs b/src/VisualStudio/Core/Def/Implementation/ProjectSystem/VisualStudioProjectTracker.cs
index ba65d9cb02ed1018334fedc0fd7fefc8ce31bcff..7ae2a4ffe0d4bbf32c7c3d19f5191c2b3e470c0b 100644
--- a/src/VisualStudio/Core/Def/Implementation/ProjectSystem/VisualStudioProjectTracker.cs
+++ b/src/VisualStudio/Core/Def/Implementation/ProjectSystem/VisualStudioProjectTracker.cs
@@ -215,9 +215,12 @@ internal void AddProject(AbstractProject project)
 
         internal void StartPushingToWorkspaceAndNotifyOfOpenDocuments(IEnumerable<AbstractProject> projects)
         {
-            foreach (var hostState in _workspaceHosts)
+            using (Dispatcher.CurrentDispatcher.DisableProcessing())
             {
-                hostState.StartPushingToWorkspaceAndNotifyOfOpenDocuments(projects);
+                foreach (var hostState in _workspaceHosts)
+                {
+                    hostState.StartPushingToWorkspaceAndNotifyOfOpenDocuments(projects);
+                }
             }
         }