diff --git a/reactos/subsystems/mvdm/ntvdm/clock.c b/reactos/subsystems/mvdm/ntvdm/clock.c
index 7208b7053ad..c89da7e8fac 100644
--- a/reactos/subsystems/mvdm/ntvdm/clock.c
+++ b/reactos/subsystems/mvdm/ntvdm/clock.c
@@ -120,7 +120,8 @@ VOID ClockUpdate(VOID)
         }
 
         /* Yield execution to other threads */
-        NtYieldExecution();
+        // FIXME: Disabled because it causes timing issues (slowdowns).
+        // NtYieldExecution();
     }
 }