If you see a message stating "This tab shares resources with other tabs..." infobar while DevTools is open, then you are part of the small group with the Process sharing experiment enabled. This post explains the experiment.
What's the experiment about?
Normally, when you open multiple tabs from the same website (like Google Docs), Chrome creates a separate renderer process for each. The Process sharing experiment changes this by allowing multiple tabs to share the same renderer process.
The goal is to improve performance. For example, faster page loads, improved (LCP), and lower memory use. You can learn more in this detailed document.
How does this affect developer experience in Chrome DevTools?
Since tabs might share a process (and its main thread), there are two impacts on debugging and performance analysis:
Breakpoint debugging. If you pause the debugger in one tab, it can affect others sharing the process. You'll see the "Debugger paused in another tab, click to switch to that tab." warning. Performance analysis. Heap snapshots and performance recordings might capture data from multiple tabs, making results harder to interpret.
Opting in or out of the experiment
Who's opted out by default
This experiment is turned off by default for the following users:
- Chrome Enterprise users
- Chrome For Testing
- Chrome Headless
- Developers who've used DevTools recently (in the past seven days)
Opting out
You can manually opt out by clicking the Opt Out button in the warning. Or, disable the Enable ProcessPerSite up to main frame threshold experiment using Chrome flags settings (chrome://flags/#enable-process-per-site-up-to-main-frame-threshold).
Opting In
To explicitly test the new experiment feature, launch Chrome with the following command line flags:
--enable-features=ProcessPerSiteUpToMainFrameThreshold:ProcessPerSiteMainFrameThreshold/20 -disable-features=ProcessPerSiteSkipDevtoolsUsers,ProcessPerSiteSkipEnterpriseUsers
Feedback
We'd love to hear your feedback on the Process sharing experiment! Share your questions or any issues you encounter in this feedback tracker.
Download the preview channels
Consider using the Chrome Canary, Dev, or Beta as your default development browser. These preview channels give you access to the latest DevTools features, let you test cutting-edge web platform APIs, and help you find issues on your site before your users do!
Get in touch with the Chrome DevTools team
Use the following options to discuss the new features, updates, or anything else related to DevTools.
- Submit feedback and feature requests to us at crbug.com.
- Report a DevTools issue using the More options > Help > Report a DevTools issue in DevTools.
- Tweet at @ChromeDevTools.
- Leave comments on What's new in DevTools YouTube videos or DevTools Tips YouTube videos.