Style encapsulation is the useful feature of Web Components for React (but I'd personally prefer inline styles).https://twitter.com/addyosmani/status/776107988767485952 …
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: this will always be slower. You're defeating all of our parser opportunities, to start with. It's a bad idea.
Apparently recalcs when adding new sheets is a big cost for us. Per-element styles seem to solve that.
We're working on making inserting sheets faster, definitely something we're fixing.
Reapplying style rules is the major FB bottleneck after JS parse time. JS parsing can be cached but not the styles.
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