I just bought Saints Row 2 on GOG, it doesn't crash but the game does run at about 2x normal speed, is there a known fix for this?
I've looked online but I can't seem to find anything that would help me.
Yeah, it's a long standing issue with the game and the threads here about the game performance mention this. GOG's version is supposed to be the best so far in terms of keeping a steady framerate, but as for running too fast, that's because of the game being designed for a specific speed. There's info on it at the PCGamingWiki: http://pcgamingwiki.com/wiki/Saints_Row_2#Saints_Row_2_running_too_fast_at_1.5x_speed
You can try the fixes it mentions, or you can throttle your CPU, run it on single or dual core rather than quad or however many cores your CPU has. The Gentlemen of the Row mod is also supposed to help with this.
None of the fixes seem to be guaranteed, though.