Wordpress LScache Plugin: FOUC on Firefox with Load CSS Asynchronously
Last Updated on: Wed, 15 Apr 2026 00:00:02 Dear Support Team, i am using Lite Speed on three different sites. It works good. But when I turn on Load CSS Asynchronously I get problems with flashing FOUC in Firefox. Most with this site: http://www.willi-auerbach.de. ? http://www.magic-man.de & http://www.magic-man-show.com work better. I tried everything you suggested in the documentation to resolve this problem. But without success. The problem is still there if I turn Generate Critical CSS In Background on or off. Do you have a idea, where the problem could be? With edge browser everything works fine. Thank you for helping me. Regards, Willi. This topic was modified 2 years, 5 months ago by themagicman. The page I need help with: https://www.magic-man.de Hi, Please check this wiki Best regards, But this is not the problem. In my case the CCSS is inserted inline into the HTML of the page. But maybe its not FOUC than. Here is a video of what i am taking: https://www.dropbox.com/s/y9o14x9cgp3irft/IMG_2134.mov?dl=0 The menu is blinking when I change the sites. http://www.magic-man.de Hi, No , thats not FOUC I would only guess that small flash is due to different resolution , the CCSS generator mimic with 1366?768 , if you view it with different/higher resolution , it could behave like that what do you mean by menu is blinking ? Best regards, Okay, thank you. But how can I get rid of this kind of FOUC? With blinking i mean that kind of behavior like in the Video. Hi, Seems no way to get rid of it besides disable load CSS async. Anyway , I will talk to dev to see if there is any improvement can be made on such cases. Best regards, That would be great! Because it is just on Firefox.
LiteCache Rush: Speed comes from using less, not from doing it faster
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