Resems

2 questions it should be downloading a downloaded torrent ? around 10MB/s i get like 500kB/s download on a downloaded torrent .... wtf ???? second , i use windows 7 , if the speed goes more than 3MB/s then the hole system is slowing down , it moves by frames when i used the 1.8 i didn`t have that problem.... by the way , windows chaching is off !