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This already happened to some extent. Repo files and the sidebar are loaded client side and are slow

I'd argue that many of the problems articulated in the article are a result of GitHub's recentish "modernization" switch to React.

The article is complaining exactly about 'modernization'.

You might want to read the article a bit closer: It's complaining about exactly that.

It's a rails app right now, so I'd be surprised if anything else would be slower lol. Except if they really screw up the rewrite or something, but tech wise almost anything else would be faster.