It’s times like these I’m glad I build my Ryzen box:
11:24:08 up 3 days, 20:38, 1 user, load average: 29.87, 23.21, 12.18
Running a test were I subset ~60,000 fonts, then read each one back and check that it’s valid. ETA is about 10 mins.
fd '\.(ttf|otf|ttc)$' ~/Downloads/Font\ Collection | sort | parallel --bar ./subset-validate {} | tee subset-validate.txt