I've seen spikes but not to the point of being unusable if I only have uBlock installed. If I have both uBlock and NoScript installed but I allow javascript from YT and block it from google.com I get massive spikes due to some intermittent dependency on Google at about 60 seconds. It's hard to compare notes with others as they seem to do A/B testing on different groups of CIDR blocks. I stopped logging into YT ages ago.
This is on a Debian fork, Firefox ESR and regular Firefox. I've also never browsed the web from a phone. I am not a developer much less a JavaScript developer so I really do not understand what they are doing in the background. Rumble works fine for me, no spikes at all.
