I grew up during the dial up era of internet and remember how insane it was each time the technology improved, broadband, dsl, fiber etc.
I wouldn’t expect pages to instantly load, but I have to imagine all the data farming is causing sites to be extremely bogged down.
I have been using uBlock for an extremely long time now and sites seem to become faster over time even though I have never upgraded my laptop all these years.
When I tried to disable uBlock for a day, my laptop forcefully shut down after 30 minutes.
Software optimization over time improves performance but is outweighted by the tracking crap they put in there.