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What's New In DevTools (Chrome 64)

Welcome back! New features coming to DevTools in Chrome 64 include:

Read on, or watch the video version of these release notes below.

Performance Monitor

Use the Performance Monitor to get a real-time view of various aspects of a page's load or runtime performance, including:

  • CPU usage.
  • JavaScript heap size.
  • The total number of DOM nodes, JavaScript event listeners, documents, and frames on the page.
  • Layouts and style recalculations per second.

If users are reporting that your app feels slow or janky, check the Performance Monitor for clues.

To use the Performance Monitor:

  1. Open the Command Menu.
  2. Start typing Performance then select Show Performance Monitor.

    The Performance Monitor Figure 1. The Performance Monitor

  3. Click a metric to show or hide it. In Figure 1 the CPU Usage, JS heap size, and JS event listeners charts are shown.

Related features:

  • Performance panel. Walk through a critical user journey and record everything that happens on the page, including JavaScript activity, network requests, CPU usage, and much more. Can also be used to analyze load performance. Learn more.
  • Audits panel. Run a suite of automated load and runtime performance tests against any URL. Learn more.

If you're just starting out with analyzing performance, the recommended path is to first use the Audits panel, and then investigate further using the Performance panel or Performance monitor.

Console Sidebar

On large sites, the Console can quickly get flooded with irrelevant messages. Use the new Console Sidebar to reduce the noise and focus on the messages that are important to you.

Using the Console Sidebar to show error messages only Figure 2. Using the Console Sidebar to show error messages only

The Console Sidebar is hidden by default. Click Show Console Sidebar Show Console
Sidebar to show it.

Related features:

  • Filter text box. Enter some text and the Console only shows messages that include that text. Also supports regex patterns, negative filters, and URL filters.

Group similar Console messages

The Console now groups similar messages together by default. For example, in Figure 3 there are 27 instances of the message [Violation] Avoid using document.write().

An example of the Console grouping similar messages together Figure 3. An example of the Console grouping similar messages together

Click on a group to expand it and see each instance of the message.

An example of an expanded group of Console messages Figure 4. An example of an expanded group of Console messages

Uncheck the Group Similar checkbox to disable this feature.

Related features:

Local Overrides

Whoops! We originally scheduled this feature to launch in Chrome 64, but pulled it close to the deadline in order to smooth out some rough edges. Apparently, the What's New UI didn't update in time. Sorry!

This feature is shipping in Chrome 65, which will land approximately 6 weeks after Chrome 64. Check out Local Overrides to learn more. If you're on Windows or Mac, you can try Chrome 65 now by downloading Chrome Canary.


The best place to discuss any of the features or changes you see here is the mailing list. You can also tweet us at @ChromeDevTools if you're short on time. If you're sure that you've encountered a bug in DevTools, please open an issue.

Discover DevTools features

Below is a list of everything that's been covered in the What's New In DevTools series.

Chrome 90

Chrome 89

Chrome 88

Chrome 87

Chrome 86

Chrome 85

Chrome 84

Chrome 83

Chrome 82

Chrome 82 was cancelled.

Chrome 81

Chrome 80

Chrome 79

Chrome 78

Chrome 77

Chrome 76

Chrome 75

Chrome 74

Chrome 73

Chrome 72

Chrome 71

Chrome 70

Chrome 68

Chrome 67

Chrome 66

Chrome 65

Chrome 64

Chrome 63

Chrome 62

Chrome 61

Chrome 60

Chrome 59