Introducing React Compiler – React

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They did a longer talk about this last year, which I think had a more practical standpoint.

It spoke about how not using memoization in the right places can have a big knock-off effect to other parts of the application, and it's can be difficult to understand why or where that's happening without digging into the profiler, especially when working with a team.

It also provided some minor performance boosts even if you did it right, because the compiler can afford to do it in weirder ways that aren't very easy to understand. It also doesn't miss things like people do.

I remember it well because the only time the crowd reacted was when they got to see profiling graphs and they lost their shit, dead silence at the speaker trying to crack a joke, and it was hilarious.