Today, @jarinsev landed a patch that optimizes this specific case in V8: https://chromium-review.googlesource.com/c/v8/v8/+/1365282 …
Bottom line: if you run into any JavaScript performance issues in your real-world code, please let us know! It’s our job to fix it.
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JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.