Poor quality playing Udemy videos
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After watching the first video I was watching using Vivaldi, the next one loaded and it has a very low definition. I opened the same video in Chrome and it's HD. I have 80Mbps fiber connection so it's not because bandwidth.
Here's the link to the course: https://www.udemy.com/blendertutorial/learn/v4/t/lecture/3559468?start=0
And here two screenshots of the same video in the same moment with both browsers:
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