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There was also a recent rollout of React, of which I've seen a number of complaints about performance related to the timing.

Personally, my Firefox Nightly on Android will regularly crash (along with the whole System UI) when opening / trying to type into a GitHub page

the treadmill of perpetual tech migrations only to find out about the downsides after months of work

Same experience here on Firefox stable on Android. The file editing portion of Github is unusable for files more than a few hundred lines.