I recently upgraded one our servers to 7.1, and since then it's been dreadfully slow to use ZWC in Firefox 4.0.1 on Ubuntu Linux 11.04. It works just fine in Firefox 4.0.1 on win32, and in Chromium on Linux as well.
Another of our servers is still on 7.0.1, and the performance there is good as expected.
I also cant seem to reproduce this on another machine, which makes it even more unfunny.
Anyone have any ideas? :|