I have added more memory and problem was solved.

But uTorrent works fine with this speed (15MBits\s). Is there more options than yours?

Hi. I use deluged 1.3.3-2 + webui on debian from testing reps. With increasing speeds from my ISP, I got an error - "performance warning: send buffer watermark too low (upload rate will suffer)" . Because of this deluge often failure. I tried to compile deluge from source using the patch f...