Brave after v1.61.120 is UNUSABLE for speed and stability

Description of the issue: MASSIVE problems started appearing in version 1.62.153 (or later). The last good working version appears to be 1.61.120.

Now Brave takes 2 minutes to fully load (I have approximately 170 tabs.) Before it took 10 seconds. Now EVERY page is slower. There appears to be a GUI update where the tabs are explaining how much each Tab is using. Sometimes tabs appear to be put to sleep to save memory? Some pages frequently crash and require full page reloads.

I have 64GB of memory, more than enough to run Brave with hundreds of tabs. But the recent update seems to have made everything perform really slow. Can anyone tell me what is wrong?

How can this issue be reproduced?

  1. Start the browser. Wait 2 minutes.
  2. During the loading process, some pages that attempt to resume from before glitch, saying “You may be offline.” Many links won’t work.
  3. The browser finally finishes loading.
  4. Sometimes tabs appear to put themselves to sleep to save memory.
  5. Even 20 minutes after everything loads and seems to be smooth again, some new heavier pages take notably longer to load. (Like Discord in the browser, Gmail, Google Drive, for the first time.)
  6. After loading a new heavier page, other new tabs are slower again for about a minute.
  7. Some pages like Discord will glitch out after a few minutes, becoming slower and slower, until they are completely non-responsive.

Expected result: The Brave browser is normally extremely fast. There is no shortage of memory on my system for it to use. The browser used to start up hundreds of tabs within 10 to 12 seconds. Tab were immediately responsive. Nothing timed out. Tabs stayed working and did not glitch.

Brave Version (check About Brave): 1.62.156 (Jan 31, 2024)

Additional Information:

Operating System: Kubuntu 23.10
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.10
Kernel Version: 6.5.0-15-generic (64-bit)
Graphics Platform: X11
Processors: 24 × AMD Ryzen 9 5900X 12-Core Processor
Memory: 62.7 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 4090/PCIe/SSE2

This problem has persisted since February 6th, and has only become slowly worse. How do I fix this problem?