Well first off, you may want to increase the number in your datarate.txt file by 2 or so, that may improve performance a bit. If you're running EQemu locally, increase it to 20.
The positioning of the mobs and how they behave is all based on your emu version and your database. Try tweaking it a bit to obtain the results you want. Or an easier way is to just pay for EQLive, as Kari suggested
I ran the emulator with ten zones on a Pentium II 233Mhz with 64MB of EDO DRAM and it worked perfectly, but if you're running the client on the same PC i would reccommend at least a 800Mhz with 256MB RAM.