i'm using kde 3.5 with current svn when i start download of torrent i have a lot of lag..... i can't move my mouse normally and my kde is too slow .... Any ideas?

Only when you load a new torrent?
That could be due to the previous pre-allocation of diskspace.

There's a new (more efficient) one in current SVN since 21 march, which makes this thing much more smooth.

This happend after disk aloc.. it's on torrent download proccess.

Are you sure KT is causing this?
What's the output of 'top' command?

Yes, i'm sure.The command is "ktorrent".I saw that in additional my KT icons gone from systray but it's still running..

I meant: could you post output of command "top" to see KTorrents CPU usage.

Type "top" in console and see what it gives.

I found the problem.. you can't use fat32 fs.....i have ext3 part and fat32 part.. with ext3 part i have no problems but with fat.. all is terrable.