Critical CSS? Not So Fast!
CSS Wizardry
SEPTEMBER 6, 2022
When you use the media -switching pattern 5 to fetch a CSS file asynchronously, all you’re doing is making the network time asynchronous—the runtime is still always a synchronous operation, and we need to be careful not to inadvertently reintroduce that overhead back onto the Critical Path. By switching from an asynchronous media type (i.e.
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