If your computer is low on specifications you can try using DirectX mode. Although it currently has some memory issues it can improve the game's performance on budget PCs (if supported). If you get an exception or any type of error while trying to run on DirectX mode that you did not get without it enabled, chances are you aren't able to use this mode at all.
To enable DirectX mode you need to add the -dx flag at the end of the target field in FreeSO shortcut properties. After adding it, click OK and restart FreeSO.