![]() Turn on the Disable JavaScript Samples checkbox. ![]() While you are recording a page, click Collect garbage ( ) to force garbage collection.Ĭlick Capture settings ( ) to expose more settings related to how DevTools captures performance recordings.īy default, the Main section of a recording displays detailed call stacks of JavaScript functions that were called during the recording. To learn how to interact with screenshots, see View a screenshot. To capture a screenshot of every frame while recording, select the Screenshots checkbox. DevTools records performance metrics while the page refreshes and then automatically stops the recording a couple seconds after the load finishes.ĭevTools automatically zooms in on the portion of the recording where most of the activity occurred. Record load performance when you want to analyze the performance of a page as it is loading, as opposed to running.Ĭlick the Refresh page ( ) button. DevTools records all page activity that occurs as a result of your interactions.Ĭlick Record again or click Stop to stop recording. Record runtime performance when you want to analyze the performance of a page as it is running, as opposed to loading. Record performance Record runtime performance This page is a comprehensive reference of DevTools features that are related to analyzing performance.įor a step-by-step tutorial on how to analyze the performance of a page using the Performance tool, see Get started analyzing runtime performance.
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