Stuttering: Stuttering is something common to many games, and is simply loading pauses as new information is being loaded up from your hard drive into RAM and/or into the graphics card's Video RAM. Unfortunately Clear Sky follows in Shadow of Chernobyl's footsteps to some degree in having noticeable pauses and stutters as you wander the game world. However unlike SoC, I don't recommend using the -noprefetch switch (See the Advanced Tweaking section), as it's likely to make the stuttering and pauses even worse. Aside from general system optimization, including disabling background programs (see below), to reduce the stuttering you should try lowering your Texture Detail setting as well as disabling Dynamic Music, and also lower your Shadow Quality and Anisotropic Filtering settings as these will help reduce the amount of data that is constantly being loaded up.