Not sure if this helps but trying to zone to lavastorm crashes my client.
Edit: I am using UF client. So far thats the only zone that 100% crashes my client and have to use the character mover.
Fix: The crash occur probably if you have modified the globalload.txt (i think) to maximise your framerate (ie, only have 3 lines for mine). I used the other everquest folder it zoned fine.
P.S. It does feel that I freeze a lot more when zoning. Specially I can see this when I use the teleporter from guildhall, or going back using the forest charm. I also see a lot more crashes or should I say kicked to main screen of the game when I die. Most of the time this happened on Plane of Fire, not sure if it has to do with anything.