I'm starting this thread in hopes that we can accumulate a list of things that can contribute to Ajax client performance problems.
In my case,in particular, I am working on a machine which may reasonably be found in the wild. It is a dual processor 1800+ machine with 1GB of memory, 80GB hard drive, onboard intel 10/100/1000GB NIC running at 100MB, onboard ATI RageXL video...probably only 8 or 16MB. Firefox 3.0.3 and IE 6 all patches on a W2k install.
Zimbra web client performance is abysmal, wretched, horrid, claw your eyes out waiting to simply move your mouse slow. It appears to do this ONLY when accessing the Zimbra system.
Thus far I have tried tweaking the NIC settings with no impact at all, however I have had problems with these Intel NICs in the past so in order of things I plan to try are:
1) Replacing the NIC with a discrete board.
2) Replacing the onboard ATI video with a discrete board.
There is nothing on the software side that is different than any other machine in the office, so I am looking at all elements. Will post my findings.