Since a while we're experiencing some very slow imaging with Zenworks imaging on Netware 6.5 SP7. A few months ago we could image a workstation with a 2.4GB image in about 10 to 15 minutes, which i think is average, but over time it has actually got worse and now takes around 30 minutes. The strange thing is that nothing has changed in our environment.

The Zenworks imaging server is a virtual machine running on VMWare ESX 4 U2. I've tried numerous things to fix the problem: changing the virtual nic from E1000 back to flexible, cneamd, pcntnw, CE1000 etc. It doesn't help anything. The average throughput during imaging is somewhere near 2,3MB/s, while the server and workstation are both connected at 1000Mbit FD. To make sure the switches in between aren't part of the problem I created a virtual machine which I tried to image on the same server as the imaging server, speeds are still the same.

Is there any way to get better speeds, what imaging speeds are normal for this setup?