Compare the f++ script https://pastebin.com/5FM7Hzef which takes 3 seconds with the bash script https://pastebin.com/RTXXEHBg which takes 3 minutes on my machine for example (both scripts create and delete 100k empty files).

Nift can build all of a basic 100k page website in ~11s and do an incremental build in ~2.25s on my 2014 11" i5 macbook air running Ubuntu 18.04, it uses under 500mb memory building the same basic website scaled to 1 million pages.