@Edmond-Dantes-2204 The Opera browser is having issues with YouTube and YouTube Music. But to improve performance, I’d recommend going to the settings:

1. Go to the “Features” section -> disable everything except “Volume Boost”, you should even disable battery saver mode, as it doesn't work as expected and causes delays.
2. Go to “Sync” -> disable “My Flow”
3. Go to “Early Bird” -> disable everything
4. Go to “Video” -> disable everything except “Show pop out button on videos”
5. Go to “Opera AI” -> disable everything
6. Go to “VPN” -> disable everything

When you visit YouTube, click the “Privacy Protection” icon in the top-right panel. Turn off everything and allow acceptable ads.
Then install the “uBlock Origin” Chrome extension and enjoy.

But even after all this, performance remains poor, and it’s better to switch to alternative browsers.