Very high CPU usage in selected tabs

[pilsnerbeer]

Description

I was watching a movie with Brave running in the background (~10 tabs open). Suddenly I noticed my laptop is VERY loud - task manager reported ~80%+ CPU usage with Brave.
Brave task manager then reported this:

The 2 tabs were IMDB movie listings (https://www.imdb.com/title/tt4123430).

Steps to Reproduce

1. open mentioned URL in brave
2. wait (minutes? 10-20min if not visible immediately)
3. observe cpu usage

Actual result:

see screenshot

Expected result:

normal cpu usage. I wasn't using the browser at the moment so I would assume no cpu usage
Note: I experienced this issue on other URLs also (youtube music) but in some cases high cpu usage may be logical

Reproduces how often:

easily?

Brave version (brave://version info)

Brave	1.32.115 Chromium: 96.0.4664.93 (Official Build) (64-bit)
Revision	17531e0a70b4f8108f2418e8b5117f465077710b-refs/branch-heads/4664@{#1229}
OS	Windows 10 Version 21H1 (Build 19043.1348)

Version/Channel Information:

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

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

Miscellaneous Information: