Take too much resource on some website

Nf

Very very good component, it works very well, it saved my eyes. I strongly suggest them to anyone.
I suggest, if possible, to autmoatically enable dark mode when Firefox's dark mode is enabled (probably inheriting system-wide dark theme) and disable it when light mode is enabled.
Thank you again for this wonderful add-on!

Why it's so slow? Significantly slowing down using Firefox at all! Much slower than other dark mode addons, why? Please fix it otherwise it is not useful even when the quality of websites looks great.