it makes a cache file of a game loaded with the game's gata, it keeps growing and growing over time, I guess you could call it a video game's cookies just like window's %temp% forlder radial.cdb is just as bad
as it keeps growing its a wonderful FPS killer so it should be deleted every couple of weeks or so.. aslo the file is meant to be kept untouched so its well hidden but there are certain tools around google that can remove the file no problem :bunny:
trust me.. even if you had a super computer i think it should be noticeable
crashes, random freeze points, sound lag, HDD working harder than usual during your game time ect
so it should be removed as many times as possible.. aslo if you don't over a period of time it can corrupt your TDU profile over a freeze point and you'd have to play the game all over again... and we all know its not that simple