GitHub says the GitHub Copilot app has rebuilt its pull request view to keep reviews fast and smooth even when the diff and conversation are enormous. To test the limit, the team opened an open source pull request with 2,200 files, over a million changed lines, and more than 400 inline review comments. The new view separates deterministic code height from dynamic comment-block heights, and uses viewport-scoped lazy measurement plus identity-based scroll anchoring.