Performance problem Citrix ICA Client 10.150 / Vista resolved (workaround)

When Citrix sessions are getting ridiculously slow, then this probably is your problem.

Finally found the solution for this problem, Windows Vista has a problem with Citrix ICA Client 10.150 due to a new feature of Vista called “Receive Windows Auto-Tuning Level”:

You can disable this feature with the following commandline option: “netsh interface tcp set global autotuninglevel=disabled” (without the quotes).

There seems to be lot of problems with this feature which probably will be resolved with Vista Service Pack 1.