Summary & Key Takeaways ​

• GitHub Copilot app's diff surface was rebuilt to handle extremely large pull requests.
• The goal was to open million-line PRs with hundreds of inline comments smoothly.
• The article details the engineering challenges and solutions implemented.
• Focus is on optimizing performance for a critical developer experience.

Our Commentary ​

This is the kind of engineering challenge that makes me genuinely curious. A million-line PR? That's a nightmare scenario for most tools. The fact they tackled it and are sharing the how-to is a win for developer experience, even if it's specific to their platform. We've all been there, waiting for a diff to load.