"Pages Unresponsive" dialog appears after opening many new windows

Description

Pages Unresponsive dialog appears after opening many new windows

Steps to Reproduce

1. install 1.37.59
2. launch Brave
3. open a bunch of new windows (command/control+N) and/or new-tab pages (command/control+T)
4. keep going until you hang
5. (you might need to wait a bit, to let the system paint the background images, then resume opening new winows/tabs, as a trigger for the above)
6. look at the resulting dialog

Actual result:

Eventually, you’ll get one of the following:

1. Pages Unresponsive dialog
2. Can't open this page error message

Pages Unresponsive	Can't open this page	Task Manager

Expected result:

No hang.

Reproduces how often:

100% (just give it ⌛ )

Brave version (brave://version info)

Happens with latest nightly as well as release 1.35.103

Version/Channel Information:

• Can you reproduce this issue with the current release? Yes
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? N/A but will report back
• Does the issue resolve itself when disabling Brave Rewards? No (default)
• Is the issue reproducible on the latest version of Chrome? N/A but will report back

cc @iambrianfung who helped confirm on his machine

[stephendonner]

@atuchin-m apologies for the epic delay 😦

At the time I filed this, we were experiencing blank tabs for some Brave News feeds due to https://github.com/brave/brave-browser/issues/21282. Long story short, I think that situation and behavior exacerbated whatever underlying issue “we” (Chromium too, as you note!) have.

We can repurpose this issue to cover the memory overhead of a) new tab b) new window, as per https://github.com/brave/brave-browser/issues/21201#issuecomment-1061031993 👍

[atuchin-m]

@stephendonner let’s clarify what we want to. It seems that we are primarily interested in how much memory/resources add one extra a) tab b) extra window. Let’s rewrite the issue (or create another one for that)?

But opening 150+ tabs is definitely out of normal browser usage scope. BTW I can confirm that there are some difficulties with both bot Brave and Chrome We merge all the new tabs in the same process to save memory. After 150+ we got OOM. IMHO it’s better than consuming a lot of memory on the PC.