Sywindt
IalaSwitching zones takes a very long time though, be warned about that (entering/leaving a guild hall or apartment or using a teleporter can take minutes in such a setup rather than seconds).
If you have a multicore machine, this is easily fixed by setting the different clients to use different cores. I use a program called WinAFC (available both in 32 and 64 bit versions) to do this for me automatically.
will have to try that (no single core machines left here, smallest has 5). Was under the impression it was mostly GPU related.