SO, I've mentioned this in one of the posts, but posting this as a separate thread now. With a video. For some reason if I use Ultra mode videos on Youtube use more time to start-up. While it's super-quick in retro-mode. Check the video I attached.
Same in portable version.
Also, just noticed, that sometimes videos embedded on other sites load fast, but when opened in Youtube - slow. So this seems to be youtube's site specific youtube.7z