>>I think there's a very simple way to test one single query: run it from one workstation with Set Optimize ON, and from another machine with Set Optimize OFF. then reboot both machines and change roles and the order of runs (just to minimize the influence of caching). Keep measuring the traffic. See the effect.
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>Have you got any good/simple method to measure the traffic on the LAN?

On Novell, you can monitor each connection at the server console. As for other networks, someone mentioned a good tool just a few days ago, but I can't remember who and when.