On: Improving site performance by shipping more CSS

[nicce]

I thought that whole point of CSS in JS was about building the CSS with JS in build time, to get managed and optimized output, who madman runs in in runtime?

[c-hendricks → nicce]

The idea of an `sx` prop kind of implies runtime. If there's any logic in those objects it can't be pre computed

[lloydatkinson → nicce]

It seems all the people criticising CSS in JS are doing it at runtime, like styled-component users.