Broad refactors and migrations often have to land as one change.
Stacked pull requests are a great way to split work into smaller changes, which makes reviews easier and helps teams ship with less risk. But some changes, like this one, can’t be split cleanly. That leaves you with a single pull request that can get very large, and the review conversation causes it to grow.
The review experience needs to remain fast and smooth even when the diff and its conversation are enormous. In the GitHub Copilot app, we rebuilt the pull request view with that requirement in mind.
To see how far that goes, we opened the biggest pull request we could find: an open source one with 2,200 files, over a million changed lines, and more than 400 inline review comments. Here’s how we made even this extreme pull request performant.
