There used to be a few 'tips' to delete particular data or config files that would grow too big over time and cause random errors or poor performance.
The point was that they would replicate the important data and regenerate as needed, and be more compact again, for a while.

Is this still a 'thing'? it's been a while since I thought of it, but I'm getting to the the 14K hours played mark with 17 toons at lvl 1750 range, and I'm starting to run into issues with random glitches. Is this something I pursue, or do I just delete the game/reinstall, and try to get the settings and configs for all 17 chars back to where they feel right again?

I still remember the old days of Windows 3.1, where reinstalling the O/S, or even a mouse, could take days to get configurations back to where they felt normal again.

Thanks for any info/hints/tips/advice, and the time you spend reading this and/or helping me out.