issue: high CPU load and jerky mousepointer when using emule (download) [XP]

Hello,

same system, XP SP3, Avast Suite 7

description:
-Avast with almost all install-options and standard settings.
-high displayed CPU load (95% off cpu load bar is kernel time), while no task seems responsible, according to ‘taskmanager’.
-jerking increases in direct relation to the download speed, which peaks at 300-350 KB/s, quite below possible maximum.
Jerking gets less when limiting max download speed.

Something in Avast must be the cause.

Which option to try changing/turning off?

-downloads via browser unaffected

-turning off avast fw removes the jerking. no solution.