Crysis is a system hog no doubt about that, so when we come across a fan community made custom config tool which allows you increase the in-game image quality and improve performance, it is definitely worth sharing
The Cuban Ultima Doom Sword's CustomCrysisConfig allows you to automatically configure Crysis tailored to the performance of your system. What this means is that it goes further than the standard “low-medium-high-very high” settings found inside the Crysis in-game menu.
The config tool installation requires .NET 2.0 and helps automate the process of finding out what custom setting is best for performance vs image quality. It gives you 5 different configuration levels, preconfigured to use with low to high end gear.