Yep, I will update the github page too to make it more obvious. The pdf is right and up to date but the page was created months ago when the docs were not present yet and is outdated. That's my fault. I have also updated the txt installation notes.
INSTALLATION:
-------------
[...]
Some scripts may require additional files or dependencies (like fonts). Check the 'INFO' section
for more details, the github page and the related pdf documentation at 'readmes' folder (if available).
[...]
Btw the problem was the console logging. Everytime the font was required and not found, the console was flooded with missing font messages (instead of only warning once) thus slowing down the entire UI. Installing the font solved the problem, but that's also a fault on the code. I have changed it to display a popup (so users are warned clearly) and log to console once per session (so the script will continue working fine without UI slowdowns).
Thanks for the report 