diff --git a/pkg/tso/keyspace_group_manager.go b/pkg/tso/keyspace_group_manager.go
index 349cdf4e289..3a574ea8333 100644
--- a/pkg/tso/keyspace_group_manager.go
+++ b/pkg/tso/keyspace_group_manager.go
@@ -607,7 +607,7 @@ func (kgm *KeyspaceGroupManager) primaryPriorityCheckLoop() {
 	defer kgm.wg.Done()
 
 	failpoint.Inject("fastPrimaryPriorityCheck", func() {
-		kgm.primaryPriorityCheckInterval = 1 * time.Second
+		kgm.primaryPriorityCheckInterval = 200 * time.Millisecond
 	})
 
 	ticker := time.NewTicker(kgm.primaryPriorityCheckInterval)