Article: Why emulation has such high system requirements.
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I ran across this article today. Even though it is about a year old, I didn't see a post on this site about it. It is mainly about the BSNES, and has some various info on SNES emulation also. Why it requires a 3Ghz+ processor to emulate SNES (almost) perfectly:
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http://arstechnica.com/gaming/2011/08/accuracy-takes-power-one-mans-3ghz-quest-to-build-a-perfect-snes-emulator/