this sounds like a weird driver issue. in 30 years of watching content on YouTube, I've never seen it stutter unless I was using some weird low power PC.
That's pretty okay spec laptop, stuttering happens only in YT on Firefox (even at 360p), never in chrome (even at 4k), or on any other site. Up to date Fedora, always recent kernels (happens on all), everything pretty much latest, symmetric 1Gbit Ethernet + fibre uplink, etc, etc.
If you'd look it up you could see its not a single person problem, it's seemingly random.
