![]() To learn how to interact with the paint information, see View layers and View paint profiler. Check the Enable advanced paint instrumentation checkbox.DevTools can't truly simulate the CPUs of mobile devices, because the architecture of mobile devices is very different from that of desktops and laptops. For example, the 2x slowdown option makes your CPU operate 2 times slower than its usual ability. Throttling is relative to your computer's capabilities. Set CPU to the desired level of throttling.Set Network to the desired level of throttling.The example above shows a recording with enabled JS samples. ![]() The example above shows a recording with disabled JS samples. The Main section of the recording is much shorter when sampling is disabled, because it omits all of the JavaScript call stacks. The following screenshots show the difference between disabling and enabling JavaScript samples. Enable the Disable JavaScript Samples checkbox.# Disable JavaScript samplesīy default, the Main section of a recording displays detailed call stacks of JavaScript functions that were called during the recording. # Show recording settingsĬlick Capture settings to expose more settings related to how DevTools captures performance recordings. While you are recording a page, click Collect garbage to force garbage collection. # Force garbage collection while recording See View a screenshot to learn how to interact with screenshots. # Capture screenshots while recordingĮnable the Screenshots checkbox to capture a screenshot of every frame while recording. In the example above, the Performance panel shows the activity during a page load. Then DevTools records performance metrics while the page reloads 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. DevTools first navigates to about:blank to clear any remaining screenshots and traces. Record load performance when you want to analyze the performance of a page as it's loading, as opposed to running.Ĭlick Start profiling and reload page. 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's running, as opposed to loading. # Record performance # Record runtime performance See Get Started With Analyzing Runtime Performance for a guided tutorial on how to analyze a page's performance using Chrome DevTools. This page is a comprehensive reference of Chrome DevTools features related to analyzing performance.
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