Welcome back! New features coming to DevTools in Chrome 64 include:
- Performance Monitor. View a page's performance in real-time.
- Console Sidebar. Reduce Console noise and focus on the messages that are important to you.
- Group similar Console messages. The Console now groups similar messages together by default.
Read on, or watch the video version of these release notes below.
Use the Performance Monitor to get a real-time view of various aspects of a page's load or runtime performance, including:
- CPU usage.
- 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:
- Open the Command Menu.
Show Performance Monitor.
Click a metric to show or hide it. In Figure 1 the CPU Usage, JS heap size, and JS event listeners charts are shown.
- 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.
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.
The Console Sidebar is hidden by default. Click Show Console Sidebar to show it.
- 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().
Click on a group to expand it and see each instance of the message.
Uncheck the Group Similar checkbox to disable this feature.
- You can group your own Console messages with
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 firstname.lastname@example.org 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 other DevTools features
Below is a list of everything that's been covered in the What's New In DevTools series.
- Support for
classredeclarations in the Console
- Improved WebAssembly debugging
- Request Initiator Chains in the Initiator tab
- Highlight the selected network request in the Overview
- URL and path columns in the Network panel
- Updated User-Agent strings
- New Audits panel configuration UI
- Per-function or per-block code coverage modes
- Code coverage must now be initiated by a page reload
- Debug why a cookie was blocked
- View cookie values
- Simulate different prefers-color-scheme and prefers-reduced-motion preferences
- Code coverage updates
- Debug why a network resource was requested
- Console and Sources panels respect indentation preferences again
- New shortcuts for cursor navigation
- Multi-client support in the Audits panel
- Payment Handler debugging
- Lighthouse 5.2 in the Audits panel
- Largest Contentful Paint in the Performance panel
- File DevTools issues from the Main Menu
- Copy element styles
- Visualize layout shifts
- Lighthouse 5.1 in the Audits panel
- OS theme syncing
- Keyboard shortcut for opening the Breakpoint Editor
- Prefetch cache in the Network panel
- Private properties when viewing objects
- Notifications and push messages in the Application panel
- Autocomplete with CSS values
- A new UI for network settings
- WebSocket messages in HAR exports
- HAR import and export buttons
- Real-time memory usage
- Service worker registration port numbers
- Inspect Background Fetch and Background Sync events
- Puppeteer for Firefox
- Meaningful presets when autocompleting CSS functions
- Clear site data from the Command Menu
- View all IndexedDB databases
- View a resource's uncompressed size on hover
- Inline breakpoints in the Breakpoints pane
- IndexedDB and Cache resource counts
- Setting for disabling the detailed Inspect tooltip
- Setting for toggling tab indentation in the Editor
- Highlight all nodes affected by CSS property
- Lighthouse v4 in the Audits panel
- WebSocket binary message viewer
- Capture area screenshot in the Command Menu
- Service worker filters in the Network panel
- Performance panel updates
- Long tasks in Performance panel recordings
- First Paint in the Timing section
- Bonus tip: Shortcut for viewing RGB and HSL color codes (video)
- Detailed tooltips in Inspect Mode
- Export code coverage data
- Navigate the Console with a keyboard
- AAA contrast ratio line in the Color Picker
- Save custom geolocation overrides
- Code folding
- Frames tab renamed to Messages tab
- Bonus tip: Network panel filtering by property (video)
- Visualize performance metrics in the Performance panel
- Highlight text nodes in the DOM Tree
- Copy the JS path to a DOM node
- Audits panel updates, including a new audit that detects JS libraries and new keywords for accessing the Audits panel from the Command Menu
- Bonus tip: Use Device Mode to inspect media queries (video)
- Hover over a Live Expression result to highlight a DOM node
- Store DOM nodes as global variables
- Initiator and priority information now in HAR imports and exports
- Access the Command Menu from the Main Menu
- Picture-in-Picture breakpoints
- Bonus tip: Use
monitorEvents()to log a node's fired events in the Console (video)
- Live Expressions in the Console
- Highlight DOM nodes during Eager Evaluation
- Performance panel optimizations
- More reliable debugging
- Enable network throttling from the Command Menu
- Autocomplete Conditional Breakpoints
- Break on AudioContext events
- Debug Node.js apps with ndb
- Bonus tip: Measure real world user interactions with the User Timing API
- Eager Evaluation
- Argument hints
- Function autocompletion
- ES2017 keywords
- Lighthouse 3.0 in the Audits panel
- BigInt support
- Adding property paths to the Watch pane
- "Show timestamps" moved to Settings
- Bonus tip: Lesser-known Console methods (video)
- Search across all network headers
- CSS variable value previews
- Copy as fetch
- New audits, desktop configuration options, and viewing traces
- Stop infinite loops
- User Timing in the Performance tabs
- Network tab renamed to Page tab
- Dark theme updates
- Certificate transparency information in the Security panel
- Site isolation features in the Performance panel
- Bonus tip: Layers panel + Animations Inspector (video)
- Blackboxing in the Network panel
- Auto-adjust zooming in Device Mode
- Pretty-printing in the Preview and Response tabs
- Previewing HTML content in the Preview tab
- Local Overrides support for styles inside of HTML
- Bonus tip: Blackbox framework scripts to make Event Listener Breakpoints more useful
- Local Overrides
- New accessibility tools
- The Changes tab
- New SEO and performance audits
- Multiple recordings in the Performance panel
- Reliable code stepping with workers in async code
- Bonus tip: Automate DevTools actions with Puppeteer (video)
- Performance Monitor
- Console Sidebar
- Group similar Console messages
- Bonus tip: Toggle hover pseudo-class (video)
- Multi-client remote debugging support
- Workspaces 2.0
- 4 new audits
- Simulate push notifications with custom data
- Trigger background sync events with custom tags
- Bonus tip: Event listener breakpoints (video)
- Top-level await in the Console
- New screenshot workflows
- CSS Grid highlighting
- A new Console API for querying objects
- New Console filters
- HAR imports in the Network panel
- Previewable cache resources
- More predictable cache debugging
- Block-level code coverage
- Mobile device throttling simulation
- View storage usage
- View when a service worker cached responses
- Enable the FPS meter from the Command Menu
- Set mousewheel behavior to zoom or scroll
- Debugging support for ES6 modules
- New Audits panel
- 3rd-Party Badges
- A new gesture for Continue To Here
- Step into async
- More informative object previews in the Console
- More informative context selection in the Console
- Real-time updates in the Coverage tab
- Simpler network throttling options
- Async stacks on by default