When the game first starts you have to go into the slider controls menu (with cheats enabled) and set the 'Screen Refresh Rate' to 120fps. If anyone is interested here's a download link to the custom MAME 0.199 build. San Francisco Rush : Extreme Racing USA rom for Nintendo 64 (N64) and play San Francisco Rush : Extreme Racing. It can be overclocked even more, but the higher the overclock the more demanding it is on your PC. San Francisco Rush 2049 Playable Sangokushi VI Playable Sangokushi VI with Power-Up Kit Playable Seaman 370: Broken. It's a pretty massive FPS increase over the default MAME, which goes as low as 15fps and probably averages 20-25fps. Midways Greatest Arcade Hits Volume 1 Playable. With the r5000 (the default speed is 200mhz) I'm averaging 40-60fps. So then I started overclocking even more to try and get a solid 60fps. I was already using a custom MAME 0.199 build that had the main CPU for Rush (r5000) overclocked to get a frame rate boost, but the game would top out at 30fps. So then I went into the MAME 0.199 source code and changed the max value to 120 to see if the game would then run at 60fps, and sure enough it did! When I put the refresh rate to the max value (67fps), Rush would top out at 34fps instead of 30, which is exactly half. I was messing around yesterday with the overclock slider controls in MAME and I noticed that if you increase the 'Screen Refresh Rate' the frames per second would actually increase slightly in Rush.
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