Try Sleep(1) instead of Sleep(0) while waiting for queries.

src/common/utilities.cpp

@@ -719,7 +719,10 @@ void ScheduleYield()
     // Emulate sleep by waiting with timeout on an event that is never signalled.
     WaitForSingleObjectEx(sleepEvent, 0, false);
 #else
-    Sleep(0);
+    if (SwitchToThread() == FALSE)
+    {
+        Sleep(1);
+    }
 #endif
 }
 

src/libANGLE/renderer/d3d/d3d9/Renderer9.cpp

@@ -614,7 +614,7 @@ gl::Error Renderer9::finish()
     while (result == S_FALSE)
     {
         // Keep polling, but allow other threads to do something useful first
-        Sleep(0);
+        ScheduleYield();
 
         result = query->GetData(NULL, 0, D3DGETDATA_FLUSH);