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Performance Issue Reporting

Performance issues are hard to track down, and a good report is necessary for fixing them.

In addition to the normal issues, please include a profile in performance-related issues.

Profiling

This extension launches a language server. Perf issue is mostly caused by the language server. Here's how to profile it.

  • You need Chrome for profiling.
  • Set scss.dev.serverPort to a number, say 8000.
  • Open chrome://inspect/ in Chrome.
  • You should see a Node.js remote target like below. That's the VLS process. Click it. image
    • If you don't see the target, click Open dedicated DevTools for Node and in the Connection tab, click Add connection and add localhost:<scss.dev.serverPort>
  • Go to the Profiler tab. Click Start.
  • Edit some SCSS files in your editor.
  • Click Stop.
  • Save the profile. Zip it and attach to issue report.