The truth about CSS selector performance

But if you’re looking for gains on the CSS side of things, Patrick has a nice way of sniffing out your most expensive selectors using Edge DevTools:

From here, click on one of the Recalculated Style events in the Main waterfall view and you’ll get a new “Selector Stats” tab. Look at all that gooey goodness!

A lot of insights here if CSS is really the bottleneck that needs investigating. But read Patrick’s full post over on the Microsoft Edge Blog because he goes much deeper into the why’s and how’s, and walks through an entire case study.

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