Edge Chromium dropping frames on YouTube videos

Deleted I have done some further testing, on my system here as someone who is in another country to me watched the same video as me and was able to not see any dropped frames and it got me thinking some more.

I did a bit more of a google search and came across this

https://forums.tomshardware.com/threads/poor-youtube-performance-on-chrome-and-edge.3359732/ 

At the very bottom it talks about screen duplication and I feel that it has almost hit the nail on the head, so I did some more tests.

1) I turned my second monitor off, nope still got the issue.
2) Made everything go to my main monitor, nope still did it.

3) Made everything go to my second monitor, and it stopped dropping frames.

Ok, so switched everything back to my main monitor, dropped the resolution from 4K down to 1080p and it stopped dropping frames.

At this point, I am like what the.....

So I then switched my second monitor back to extended and no dropped frames, but the moment I switched back to 4K, I am getting dropped frames again.

Now there is also another thing, Windows 10 for some reason, makes all the text on my 4K monitor really, really small when I am in 4K, yet in 1080p it is not. It is like Windows 10 is not scaling Window Titles correctly with the DPI. I am wondering if this is an issue with these two browsers.

To test this further, I tried this on my Surface 3. At native resolution with DPI scaling at 150%, got dropped frames. Set DPI scaling back to 100%, no dropped frames.

So the question is, did Windows 10 introduce something or did a combination of Windows 10 and Chromium introduce something.

I am still stumped why FireFox and Brave have no issues no matter what though!