So, I used to be able to have good performance on FFXI, even at maximum graphics settings (never dropping below 25 FPS), but as of a few weeks ago, I've been getting constant FPS drops. With the same settings, I'm getting about 5 FPS in battle areas, and 10 FPS in towns or less cluttered areas (10/15 with everything set to minimum).

I have the same background programs running as before, antivirus and malwarebytes don't pick up anything, and Task Manager doesn't seem to list anything suspicious (other than maybe a higher GPU use by FFXI than I seem to remember; 30-40%, but I could be misremembering).

Any suggestions on where to look to figure out the problem?