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Actually I didn't notice such thing when I used it extensively around 2013 for instrumenting some page loads. Which part was slow in your experience?

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If I remember well was slower than using HTMLUnit (http://htmlunit.sourceforge.net/) that is written in Java, and it was much slower than writing a browser extension to achieve the same task.

I see, well I've never performed any benchmark but it's quite possible that an ad hoc headless browser performs better for what concerns repeated tests. On the other hand, in this case you're instrumenting a real (really employed by the final user) browser. Possibly things will improve with this new headless mode for Chrome.

In any case this JavaScript module should not introduce any performance degradation, but if it does and you happen to give it a try in the future, feel free to open an issue.

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