speed drop win32 between 8.1.751 and 788

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I noticed theres speed drop and older version worked a bit faster,tested on rocky balboa, undead knights, also games work faster in PSP native resolution in x1 window but i cant display them like that in fullscreen cause they get rescaled to higher resolution anyway, can this be optionable cause i would like to keep 480x272 in fullscreen, i dont care that it might look bad or something and would be good to show someone whats the real PSP resolution compared to emulator supporting higher resolutions.