How to remove styles loading delay in Mozilla Firefox?

Question

css

Please tell me who faced. All browsers are fine.
In Mozilla Firefox, when loading a page, it shows a page without styles for about half a second, which is very annoying.
The style file is written in head as it should.
I tried the method from the article , but it did not help.
What can you suggest?

Answer 1

Critical Path CSS, google it. Plus online service https://jonassebastianohlsson.com/criticalpathcssg...