The font cache re-runs every time you change your fonts folder.

It's like what you do with `fc-cache`, but on Windows you get per-application caches for apps that uses fontconfig (they carry their own copies of fc). Every time you install a new font or update your system, you have to do a recache for each of these apps.

In my case changing to a SSD dropped the booting time for GIMP (and system and every application, of course) to a few seconds. 3 or 4. But the font cache thing eats up most of it, so that'd be the real issue.