https://bugs.winehq.org/show_bug.cgi?id=44863
--- Comment #14 from Zeb Figura z.figura12@gmail.com --- (In reply to Stefan Dösinger from comment #13)
What happens if you make the buffer dynamic and keep it as a hardware buffer?
Performance is pretty abysmal. Not as bad as upstream Wine, but still pretty bad. Removing MAP_R improves it a bit more, but not enough. The fact the game isn't actually streaming (and given the pattern I don't think we can hack in NOOVERWRITE either) implies that going further down this route is not going to help.