NoNewTaleToTell: I've heard from several members here that the GOG version is fixed, but I haven't been able to test it myself as I only own the Steam version. So your GOG version has the speed up bug too?
Well, the little I tried it (to test how it runs on Windows 10), it seemed to have some kind of issue with the speed.
Anyway, now I found this: this Saints Row Guru(?) said back in May that the GOG version has the same issues as the Steam version:
https://www.gog.com/forum/saints_row_series/saints_row_2_how_is_the_performance_of_the_gog_version/post98 I don't know if anything has changed since then, should check the SR2 changelog on GOG whether it has received any changes after that... The Steam version worked relatively well even without a mod on my ASUS laptop earlier (I guess its CPU speed was close enough), but according to the racing test, the game didn't run quite on the right speed on it either.
Also as I said, unlike the Steam discussion suggests, I saw the speed issue also on Windows 8 (and 10). In fact it was even worse than on Windows 7 because in Windows 7 I was able to change the speed to correct one with the mod, but on Windows 8 the mod didn't change anything, and the game was still running at a wrong speed. Not sure if I did something wrong there, but I did all the same steps as I did successfully on Windows 7.