I admit - I had a greta fun last night...with this game

[Ataros]

After defragging game cache in Steam Gamebooster defragger still finds many fragmented files. I downloaded several games demos from Steam last week and every time this was the case. Either Steam or Gamebooster is cheating. Anyway it does not hurt to defrag using Gamebooster as well. It defrags a selected game directory only quickly. I did so since release and had very few stutters (high textures, med landscape lightings, shadows on ~40-45 fps). Gamebooster is free.