Red Faction: Guerrilla
From PCGamingWiki, the wiki about fixing PC games
Red Faction: Guerilla is a PC port of a console game. DirectX 10 mode causes some big performance hits. Template:Infobox
Performance Issues
DirectX 10 mode is not optimized, and therefore when enabled can cause large performance drops on high end computers. Simply disabling Ambient Occulsion can enable a 30FPS performance boost.