https://bugs.winehq.org/show_bug.cgi?id=52281
--- Comment #8 from i.Dark_Templar idarktemplar@mail.ru --- (In reply to joaopa from comment #7)
You should fix that at first: err:winediag:ntlm_check_version ntlm_auth was not found or is outdated. Make sure that ntlm_auth >= 3.0.25 is in your path. Usually, you can find it in the winbind package of your distribution.
When slowdown begins to occur how is your free memory? Slowdown could be a memory leak.
Hmm, usually not having samba installed doesn't cause any issues, but I'll try installing it and see if it fixes something in this case.
Game uses more memory over time. I've checked that increased memory consumption happens on windows too. I guess it either keeps more data during gameplay (generated/killed monsters info, travelled map, etc) or leaks, or both.