Description
Link to the code that reproduces this issue
https://github.com/mikehdt/nextjs-15-2-perf-issue
To Reproduce
pnpm ipnpm dev
Click on some of the buttons and observe performance. There's a lag to the action.
- Revert
nextinpackage.jsonto15.1.7 pnpm ipnpm dev
The buttons are noticeably more performant.
Current vs. Expected behavior
There should not be a performance regression?
Using the React dev tools profiler, we can see the difference (this is a slice that shows the render time for clicking one of the buttons):
Next.js 15.1.7
Next.js 15.2.1
Provide environment information
Running on Windows 11 / Node 22 but the env shouldn't really be an issue.Which area(s) are affected? (Select all that apply)
React, Performance
Which stag 6CE8 e(s) are affected? (Select all that apply)
next dev (local)
Additional context
It took me three days of trying to debug my own code in a personal project before I realised it wasn't me, it was next.js 😅