So I had been wanting to report on this issue for a while and I think I hinted it to
@ploggy on my last post but here is a more detailed account.
When activating “Fixed Interval” under core options with the latest Unai build you can benefit from a huge enough boost on most 2D games, enough to be able to use video filters if set at 60fps, but the drawback is that activating Fixed Interval will get you flickering graphic garble and most times it will even throw font assets from the games on the screen. You can try with any game to see this but the first one I tried it with was with Capcom vs SNK.