http://bugs.winehq.org/show_bug.cgi?id=13470
--- Comment #19 from Troy James Sobotka troy.sobotka@gmail.com 2011-09-24 11:20:51 CDT --- Valeriy Malov 2011-09-24 02:22:45 CDT "On a side note, from Google it seems like loading time is common problem for people running it on a native OS too, so it could be an exaggerated bug from the original game or even expected behavior."
I assure you it is _not_ an exaggerated bug report.
The loading time difference between Wine's implementation and the proper OS is a radical departure. The proper OS clearly loads a good deal of high resolution textures and such, but it is possibly 1/50th of the loading time via the Wine implementation.
The loading time takes upwards of five minutes, sometimes into the eight to ten minute range.