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p/debugbearFront-end website performance monitoring
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Matt Zeunert

Browser Resource Hint Validator - Check preconnect and preload hints are working correctly

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Resource hints like preload and preconnect can make sites load faster, but can also hurt performance if used wrongly. This tool checks your site for common problems with them.

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Matt Zeunert
Maker
Hi everyone 👋 I run a website monitoring tool and noticed that a lot of sites use resource hints incorrectly. For example, preloading a large number of low-priority resources or missing a crossorigin header for a CORS request (so that the browser can't use the downloaded resource). The validator checks for common problems with resource hints. Hints are confusingly complex, so I'm there are many edge cases that aren't fully covered right now. Let me know if you run into one!
Colin McDermott
Have used this a bunch in the last couple of weeks, really great tool. Good work @mattzeunert Sent me off down multiple rabbit holes... emerged at the other end with a faster site!