I switch off ad blocking once...
Never. Again.
For some context I have MSI GS40 - 3.5Ghz Quad Core i7 with 16gb of RAM and a 256gb SSD - a laptop thats not short on performance and a 60mb internet connection.
I once switched off the NoScript and Ghostery FireFox add-ons and, well... page load times massively increased as if I was on dial-up, some pages had (according to Ghostery) 40-odd trackers/adverts and such, and (according to NoScript) 20-odd external scripts, the pages jumped all over the place with scripts messing about with the DOM, images resizing, fonts changing and zooming in or out, auto-play video's that expand and shrink when done and move the content about, and on, and on, and on, and on...
Err, thanks but no thanks. Until websites stop actively creating a jarring, time-consuming and painful user experience then my ad/script blockers are staying firmly on. You can call me a freeloader, I don't really care, but you can only call me that if you've never, ever skipped adverts on anything you've PVR'd.