9+ Saved Group Tabs Causes Intermittent Unresponsive Behavior

[hspencer77]

Description

Running Brave 1.66.110 with the following:

• 12 windows, where each window has around 20+ tabs
• 9 saved group tabs

When running for about 30 minutes, any new tab opened or any scrolling on an existing page will be delayed. Sometimes the 'rainbow wheel' on Mac OS will show up before the browser becomes responsive.

Steps to reproduce

1. Open Brave Browser
2. Launch 10+ more windows with 20+ tabs
3. Create 9 (or more) group tabs with 4 or more tabs in each group
4. Navigate open new tabs and navigate the web for around 20 minutes

Actual result

• Browser slowed down
• unable to open new tabs for a few minutes
• existing web pages hang for a few minutes (unable to navigate)

Expected result

Navigation and tab management should be normal.

Reproduces how often

Easily reproduced

Brave version (brave://version info)

brave_1_66_110_system.txt brave_1_66_110_version.txt

Channel information

• [X] release (stable)
• [ ] beta
• [ ] nightly

Reproducibility

• [X] with Brave Shields disabled
• [ ] with Brave Rewards disabled
• [ ] in the latest version of Chrome

Miscellaneous information

brave_1_66_110_about-gpu-2024-05-20T20-02-49-877Z.txt brave_1_66_110_historgrams.txt

[rebron]

cc: @atuchin-m

[hspencer77]

FYI, I updated my system to macOS Sonoma 14.5 (23F79) - applied a security update. I provided a new trace to @atuchin-m after I was able to recreate the behavior.

[atuchin-m]

I've checked the new trace files from DM. The issue is the results extension excessive work. The extensions or extension service workers spawn a lot of messages and browser got stuck on the processing.

some details from long UI tasks:

mojo_interface_tag: "extensions.mojom.ServiceWorker",
mojo_interface_tag: "storage.mojom.ServiceWorkerStorageControl",
{watcher_notify_interface_tag: "storage.mojom.ServiceWorkerStorageControl"}