How to get YouTube working better in Chromium and Chrome browsers

At least in old computers, OpenGL is much better rendering that browser´s default, so for getting OpenGL on, go to chrome://flags/ and enable software rendering list

With other useful settings

Override software rendering list -> Enabled

Smooth Scrolling -> Disabled

Toggle a performance metrics overlay while Cast Streaming -> Disabled

GPU rasterization -> Disabled

Accelerated 2D canvas -> Disabled

Relaunch browser and see difference.