I don't think it's other applications. My machine (2.4Ghz) idles at around 15% CPU (well, I say idle, that's with web browser, mail client, IM client etc. open) on Ubuntu, and as soon as I start Fiesta it's up to 95-100% CPU. Admittedly, some of that may be WINE overhead, but even so, it is a pure resource hog.
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