Some months ago, I started to use PHP 8.0 with Wampserver64 (see https://wampserver.aviatechno.net/ for downloads) and after an update, all local projects started to be very slow, and at the same time I also got "disk full" alerts.
Using the program TreeSize Free (excellent German Program that shows the size of every directory), I located a directory with inflated size : C://Wamp64/tmp