Youtube stuttering and dropping resolution

[mrmeireles]

For several weeks now, Vivaldi is behaving on Youtube. It's basically impossible to watch videos in more than 480p. I already disabled all the extensions. My internet band and PC are good enough for 8K. On the other browsers everything plays fine. The "Stats For Nerds" doesn't show any clue to me that something is wrong.

What's going on???

My setup:
5.1.2553.3 (Official Build) (64-bit)
Windows 10 Version 10.0.19043.1466
32 GiB RAM 3200Mhz
i9 9900K
Asus TUF RTX 3060 ti driver version 496.49
System SSD: Samsung 970 PRO 512GiB (half free)

K-Lite codec pack 15.9.4 Standard
Malwarebytes Premium 4.5.2
vivaldi://flags is default
Extensions: all disabled

[DoctorG]

@mrmeireles Try with a extra profile without any extension or setting. Please check Troubleshooting issues.

After you checked all items and that did not solve your issue, tell us more:

• OS version and build

• Installed third party security tools like Antivirus, Internet Security etc.

• Installed extra codecs in OS

• Installed third party ad/tracker filter or blocker

• Installed latest chipset/GPU driver from graphics producers website

• Vivaldi version
  Open page vivaldi://about

• Use of Vivaldi ad/tracker blocker
  Activated block lists

• Info about changed settings in page vivaldi://flags

• Installed extensions
  Open vivaldi://system
  Section extensions
  Button Maximise…
  Copy the items
  Paste with </> button

• Info about GPUs
  Open vivaldi://gpu
  Hit button Copy Report to Clipboard
  Paste with </> button

• Updated DRM codec
  Open vivaldi://components
  Scroll down to "Widevine Content Decryption Module"
  Post version number here
  Try to update Widevine with "Check for Update" button

• Info about media usage
  Open vivaldi://media-internals
  Click on Copy to Clipboard
  Paste with </> button

• Visit the following links and tell us which options are selected for the selected flags:
  vivaldi://flags/#ignore-gpu-blocklist
  vivaldi://flags/#disable-accelerated-video-decode

• URL where issue happens and if a player is used on webpage, the setting for video or audio format

• Information if a Vivaldi downgrade was used before with current browser profile