Fixes to try before bashing your keyboard in frustration everytime you turn the mouse
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Reinstall EQ. Full, clean install, using nothing but the Titanium discs/iso. NO ADDONS. No duxa ui, no duxa installer. Do it right, add things later.
WinEQ2, fixes most peoples problems
You should NOT need an SSD, that shouldn't affect framerate lag in any situation for any reason, unless your hard drive is from 1999, is extremely slow for some other reason, or you're having some other issue with the drive. EQ doesn't pull files from the HD after you zone in, so drive lag in loading doesn't make any sense. That being said, loading EQ from RAM may still help if you have an issue with your drive (like i said above), so its worth a shot.
Limit MAX Fps to 35. Yes, this will look a little stuttery on its own, but it should be much smoother than what you all are describing.
In vista/7/8 Disable Aero, or in 8, any fancy graphics options. In general this is something I do regardless just because I like the minimalist interface, but it should help performance in EQ. Old programs can sometimes have graphics issues with aero runnning during play.
If you're still having issues after doing all that, can try reposting in this thread and I'll see what else can be done. I'll try to keep an eye on this thread. PM'ing me is also an option.