yeah, I also tried converter, got an error on the first line despite the fact that I never changed it (made barely any edits yet). So I just extracted the code from Chrome, copied it into Sublime Text, saved as CSS, uploaded it to assets, and pointed to it in theme.liquid.
I didn’t notice anything happening faster as far as the “speed score” goes, but I immediately noticed the interface as being much faster for me. Which is helpful.
Thanks a lot!