[rosywoozlechan]

I believe they don't have much of a frontend stack at all, it's just a little bit of JavaScript, so I don't understand how the UX would be laggy if it doesn't actually do much.

[akiselev]

Poor understanding of DOM updates, requestAnimationFrame, and async programming in single threaded JS GUIs is my guess.

[coldtea]

We have been understanding all these for 20 years at the level Hey uses them, so if there's indeed a problem, it can hardly be that...

[madeofpalk]

You can still write bad code without React.

[JamesSwift]

Because its hard to have seamless / performant UX when requests necessarily dont share DOM state. You run into the same issues on native mobile applications.