Lets say you're targeting mobile...is 15K a lot? Depends on the effective tax rate of everything else. Add that to React + React DOM + a router + polyfills ('cause everyone serves bloody polyfills)...can you afford another 15K? https://infrequently.org/2017/10/can-you-afford-it-real-world-web-performance-budgets/ …
This, again, is about interactivity. Scrolling is an interaction, but script can block it. Doing work in response to interaction makes tons of sense (hence lazy-loading), and doing work off-thread is great (hence image loading is "lighter" because we parse/rastter off thread).
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& Web Standards TL; Blink API OWNER
Named PWAs w/
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