Initially starting TGC, it was running at 1 FPS (slower, actually). After spending 15 minutes, I managed to lower all graphic options. I managed to change the resolution to 1280 x 1024/Full screen. It ran smoothly at 40 FPS after I reduced shaders/anti-aliasing.
Check if a machine has low standards (like mine); If so, offer to start on low graphics
Have a 'safety mode' type boot (lowest possible graphics/audio/etc) for people with older machines
Have a quick "CHECK ALL" option for lowering graphics (so people don't have to manually lower/raise everything)
Thanks for your suggestions. Ok I will set in the future an option to set low, medium, high, ultra high graphics and I will of course think to introduce a safety mode The game will also start on low graphics. For this release I don't had time to put all the things to low... But it runs fine ingame now???