Not too many people play Dark Age of Camelot anymore but recently I did get the Labrynth of the Minotaur expansion pack and well, I have some issues. The labrynth is laggy as frickin hell. Possible reasons:
Graphics: The resolutions on the textures are very high and there are a lot of monsters and player models that have fairly high poly counts. No dynamic shadows, btw.
Zone Lag: More on the server side, nothing really I can do about this one.
CPU Lag: Lots of people running around, throwing spells effects going off, etc. I can see how this can add up.
The real issue is Im getting a little under 20 fps in action in the Labrynth but I do have a custom Built PC featuring a C2D E6400 processor, a gig of DDR2 ram, and a 7600GT which is pretty damn good. Any possible areas I can improve upon to make the frames steady as can be or is this sort of a closed end problem.
Also, I may have mispelt Labrynth several times.
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Obviously you can lower the video settings to see if it's the video card at fault.
Looking around in the driver settings might also reveal some system-wide settings that might be causing this.
I doubt it's caused by the CPU, unless you have a lot of crap running in the background or something, and even idle programs/services can eat up memory (though I guess low physical memory would mean the more noticeable swapping/short freezes rather than overall lower performance).
I use this Services Guide to see what's safe to disable.
There might also be some other causes specific to your hardware (eg. IIRC some games had problems with dual-core CPUs and required manual assigning to only one of the cores or some on-board sound hardware acceleration issues) which you should find mentioned on the game's support forums.
At night, the ice weasels come."