Anecdotally, µTorrent and wineserver collectively occupy 13.6 MiB of real allocated stack (very little of this is wineserver). Sun's JRE running Azureus creates a 54.9 MiB stack. As far as CPU cycles go, usage should be very comprable to that on Win32 since, again, Wine is an API implementation (this ignores, of course, situations where a bug causes an infinite loop and places where Wine's implementation of a function is much less efficient than Win32's).