Finally got that bin working after building a debug build from your fork, so i'm NOT running the same custom fork as i was before, but the results are (again...) promising:LOL. Please try the attached MP and let me know if you see your 33fps again.
1. First ran the debug build i compiled from your fork -> GUI @ 32 FPS
2. Replaced MediaPortal.exe, started MP -> GUI @ 50 FPS