https://bugs.winehq.org/show_bug.cgi?id=52281
--- Comment #7 from joaopa jeremielapuree@yahoo.fr --- You should fix that at first: err:winediag:ntlm_check_version ntlm_auth was not found or is outdated.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.