GitHub's Performance Improvements for Pull Request Diff Rendering
By
Luke Ghenco
Baker's choice. Dense with flavour, light on filler.
Summary
GitHub engineers discuss their efforts to improve performance in the pull request review experience, specifically focusing on the Files changed tab. They explain the challenges of handling large pull requests at GitHub's scale and detail their migration to a new React-based implementation. The article covers technical optimizations for diff line rendering, performance improvements, and the engineering philosophy of simplicity in solving complex performance problems.
Key quotes
· 5 pulledPull requests are the beating heart of GitHub. As engineers, this is where we spend a good portion of our time.
At GitHub's scale—where pull requests can range from tiny one-line fixes to changes spanning thousands of files and millions of lines—the pull request review experience has to stay fast and responsive.
We recently shipped the new React-based experience for the Files changed tab (now the default experience for all users).
One of our main goals was to ensure a more performant experience across the board, especially for large pull requests.
The path to better performance is often found in simplicity.
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