I posted this at Emutalk but it hasn't generated any responses except one. This was tested on Windows XP x64 SP2 with Dolphin 64 Beta 3 and Windows Media Player 11 x64. My specs are an AMD64 X 2 3800+ @ 2.0 Ghz Processor, 1024 MB of ram, Geforce 6150LE. I can not guarantee this will work on your system but if it does and you can reproduce it successfully congrats on increasing you FPS in Dolphin. I'm not sure if this works in any other version of Dolphin such as the 32-bit version or Beta 2 of Dolphin x64. I am also not sure if this works with any other version of Windows Media Player other than WMP 11 x64. This does not appear to work on other intensive emulators such as PCSX2 as I tested it and it didn't garner any increase in speed. Most other emulators are not worth testing this with as they already run most games full speed. Read Below (Post from Emutalk): I am using Dolphin Beta 3 x64 on XP SP2 x64 with an athlon64 X 2 3800+ @ 2.0 Ghz, Geforce 6150LE, 1024 MB of ram. The issue or alleged tweak is weird in it self, on Sonic Adventure 2 Battle I was usually getting about 20 - 25 FPS on some levels and never above that, with it dipping below sometimes. I found running Windows Media Player 11 running in the background gives a significant boost in speed. After having WMP running and starting SA2: Battle in Dolphin my FPS increased by nearly 10 - 15 and even 20 FPS in SA2:Battle on Dolphin. On most levels such as the Green forest level I was now getting between 30 - 45 FPS as compared to 20 - 25 before with it never dipping below 28. Some levels were exceptionally fast now, however some levels were still fairly slow such as Pumpkin Hill and one or two/few others. I kept thinking to myself that this was fairly weird. This worked for other games as well, in Zelda: Windwaker it yielded about a 5 - 10 FPS increase, in Mario Sunshine about a 5 FPS increase. Thread at Emutalk: Weird FPS increase issue. - EmuTalk.net I have uploaded an attachment of the speed I was getting in the Green Forest level of Sonic Adventure 2. Most levels appeared to run full speed or near full speed but FPS never dipped below 28 on these levels. Some levels were still a bit slow such as Pumpkin Hill and about a few others for me as mentioned above. Mind you I am not lying so if anyone can reproduce this let me know. You also need to leave Windows Media Player 11 x64 up in the background running while you play a game on Dolphin, however you don't need to play anything in WMP itself.