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Question: Does using Selenium Webdriver have an impact on browser performance?

Background: I've been reading up on browser performance metrics, just using the browser dev tools but also looking into the Navigation Timing API and Resource Timing API. There are also some packages out there that implement these (or seem to implement them, I didn't dig into the source code) - such as browser perf.

Considering these hook into the browser environment via browser.executeScript() to return objects from window.performance, would this impact actual performance (and ultimately skew my data when compared to a user checking these metrics manually)?

Gunderson
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    You may want to use the browser to collect performance metrics so that you don't have to inject javascript. E.g.: http://stackoverflow.com/a/27653643/604131 – Mark Lapierre Mar 15 '17 at 22:56
  • Did not see that post when I was searching earlier. Good info, thanks. – Gunderson Mar 16 '17 at 11:05

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