Which game were you testing?
i dunno about the game, but i saw similar stalls in our software
a huge batch process that consumed about 1 GB on Windows would both run slower and eat up about 2 GB on Wine before crashing
i made a similar change to Steaphan's that not only improved performance, it brought the memory usage down to roughly what it was on Windows - and didn't crash
i was planning on submitting it at some point if i could think of a good test to validate it. the only difference was that i added more lists, but i'd say adding more free lists definitely makes it faster
daniel