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.
Run ublock origin and turn off all the ads and trackers. Then you can see for yourself how much faster it is.
The answer is… it depends on the page but in some cases a lot, in other cases not much.
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.