diff --git a/tools/cldr-apps/js/src/views/DashboardWidget.vue b/tools/cldr-apps/js/src/views/DashboardWidget.vue
index 67f6c422a48..0c7231368b6 100644
--- a/tools/cldr-apps/js/src/views/DashboardWidget.vue
+++ b/tools/cldr-apps/js/src/views/DashboardWidget.vue
@@ -360,7 +360,13 @@ export default {
     },
 
     catCheckmarkChanged(event, category) {
-      this.catIsHidden[category] = !event.target.checked;
+      // setTimeout solves a weakness in the Vue implementation: if the number of
+      // notifications is large, the checkbox in the header can take a second or more
+      // to change its visible state in response to the user's click, during which time
+      // the user may click again thinking the first click wasn't recognized. Postponing
+      // the DOM update of thousands of rows ensures that the header checkbox updates
+      // without delay.
+      setTimeout(() => (this.catIsHidden[category] = !event.target.checked), 0);
     },
 
     canBeHidden(cats) {
diff --git a/tools/cldr-apps/js/test/TestCldrDash.mjs b/tools/cldr-apps/js/test/TestCldrDash.mjs
index 815f60c28b1..33dc59fd00e 100644
--- a/tools/cldr-apps/js/test/TestCldrDash.mjs
+++ b/tools/cldr-apps/js/test/TestCldrDash.mjs
@@ -47,9 +47,15 @@ describe("cldrDash.updatePath", function () {
     assert.strictEqual(countEntriesForPath(data1, "710b6e70773e5764"), 1);
     assert.strictEqual(countEntriesForPath(data1, "64a8a83fbacdf836"), 1);
     // the entry for 710b6e70773e5764 should have 3 notifications
-    assert.strictEqual(countNotificationsForEntry(data1, "710b6e70773e5764"), 3);
+    assert.strictEqual(
+      countNotificationsForEntry(data1, "710b6e70773e5764"),
+      3
+    );
     // the entry for 64a8a83fbacdf836 should have 1 notification
-    assert.strictEqual(countNotificationsForEntry(data1, "64a8a83fbacdf836"), 1);
+    assert.strictEqual(
+      countNotificationsForEntry(data1, "64a8a83fbacdf836"),
+      1
+    );
   });
 
   it("should remove entries", function () {
@@ -61,7 +67,10 @@ describe("cldrDash.updatePath", function () {
     assert.strictEqual(countEntriesForPath(data2, "710b6e70773e5764"), 0);
     assert.strictEqual(countEntriesForPath(data2, "64a8a83fbacdf836"), 1);
     // the entry for 64a8a83fbacdf836 should have 1 notification
-    assert.strictEqual(countNotificationsForEntry(data2, "64a8a83fbacdf836"), 1);
+    assert.strictEqual(
+      countNotificationsForEntry(data2, "64a8a83fbacdf836"),
+      1
+    );
   });
 });