Don't search beyond Sync roots for highest priority work (#13335)

facebook · Aug 7, 2018 · 3b3b7fc · 3b3b7fc
1 parent 43a137d
commit 3b3b7fc
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/packages/react-reconciler/src/ReactFiberScheduler.js b/packages/react-reconciler/src/ReactFiberScheduler.js
@@ -1841,6 +1841,11 @@ function findHighestPriorityRoot() {
         if (root === lastScheduledRoot) {
           break;
         }
+        if (highestPriorityWork === Sync) {
+          // Sync is highest priority by definition so
+          // we can stop searching.
+          break;
+        }
         previousScheduledRoot = root;
         root = root.nextScheduledRoot;
       }