Why is GitHub UI getting slower?

9 months ago

GitHub UI has been getting noticeably slower recently, with actions like switching tabs taking over 5 seconds.
Using Turbo for preloading pages is backfiring, making client-side transitions slower than server-side loading.
Opening links in new tabs is faster than using client-side routing, which defeats the purpose of SPAs.
The new loading bar highlights the slow transitions, making the experience worse.
Performance issues extend to the diff view, which freezes when handling large PRs due to excessive DOM nodes.
Resizing dev tools windows causes freezes, indicating deeper performance problems.
GitHub's roadmap mentions 'Platform collaboration at scale,' but it's unclear if performance improvements are a priority.

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