A thread spending over half its time in poll() likely indicates either one of two things: there are thousands of FDs being run through poll (this seems rather unlikely if you only have one WINE application working), or there is an event being triggered every time poll is invoked, or within a few ms at most (much more probable.) This may be due to a bug of some sort either in WINE or in Haiku; possibly there is some error condition not being cleared. It is worth investigating on the WINE side of things to see what is precisely happening.
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