diff --git a/common/changes/office-ui-fabric-react/jspurlin-ContextualMenuUpdateMouseMoveBehavior_2018-04-17-17-55.json b/common/changes/office-ui-fabric-react/jspurlin-ContextualMenuUpdateMouseMoveBehavior_2018-04-17-17-55.json
new file mode 100644
index 0000000000000..84b39b0f1ff81
--- /dev/null
+++ b/common/changes/office-ui-fabric-react/jspurlin-ContextualMenuUpdateMouseMoveBehavior_2018-04-17-17-55.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "office-ui-fabric-react",
+      "comment": "ContextualMenu: Update mousemove to only do anything if there is not another pending mouse enter/move/leave to improve the snappiness of the updates",
+      "type": "patch"
+    }
+  ],
+  "packageName": "office-ui-fabric-react",
+  "email": "jspurlin@microsoft.com"
+}
\ No newline at end of file
diff --git a/packages/office-ui-fabric-react/src/components/ContextualMenu/ContextualMenu.tsx b/packages/office-ui-fabric-react/src/components/ContextualMenu/ContextualMenu.tsx
index 80f200115260e..bf64647c86c86 100644
--- a/packages/office-ui-fabric-react/src/components/ContextualMenu/ContextualMenu.tsx
+++ b/packages/office-ui-fabric-react/src/components/ContextualMenu/ContextualMenu.tsx
@@ -793,7 +793,9 @@ export class ContextualMenu extends BaseComponent<IContextualMenuProps, IContext
 
     const targetElement = ev.currentTarget as HTMLElement;
 
-    if (!this._isScrollIdle || targetElement === this._targetWindow.document.activeElement as HTMLElement) {
+    if (!this._isScrollIdle ||
+      this._enterTimerId !== undefined ||
+      targetElement === this._targetWindow.document.activeElement as HTMLElement) {
       return;
     }
 
@@ -858,11 +860,13 @@ export class ContextualMenu extends BaseComponent<IContextualMenuProps, IContext
         const splitButtonContainer = this._splitButtonContainers.get(item.key);
         this._onItemSubMenuExpand(item,
           ((item.split && splitButtonContainer) ? splitButtonContainer : targetElement) as HTMLElement);
+        this._enterTimerId = undefined;
       }, this._navigationIdleDelay);
     } else {
       this._enterTimerId = this._async.setTimeout(() => {
         this._onSubMenuDismiss(ev);
         targetElement.focus();
+        this._enterTimerId = undefined;
       }, timeoutDuration);
     }
   }