I used to have a similar problem on my AMD 3800 X2, GF 6800GT video, 4x512MB Ballistix ram, and triple raptor 74GB HDDs until I changed the processor affinity to CPU0 only AND went into the Power Options in control panel and set the "Power Schemes" to "Always On".
Processor Affinity CPU0 is a MUST at least from my studies as EQ seems to only use the primary core without issues/crashes. I have tried using just CPU1 (the second core) and still get crash issues. My guess is it's some kind of problem with the clients programing.
Setting Power Schemes to Always On cleared up my graphics lagging you were getting. While up front you would suspect it's a graphics card problem, it's actually your CPU causing it. By default, multi core CPU's scale down or even turn off un-used cores to help reduce power draws and overheating. The EQ programming seems to be missing a the programming hook to kick the CPU up to it's normal operating speed and thus leaves it at the reduced speed. For most CPUs this is around 800~1200 MHz, which is enough to play eq, but is by no means a smooth experiance you would expect.
I have also noticed on my single-core laptop that setting the Power Scheme is a must or I get similar results as my desktop dual-core.
I hope this helps and if you are still having issues, let me know and I will see if I can get you some more solutions based off of your perticular setup/problems.
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