I have not experienced this. Could it be because I only browse the web with uBlock Origin enabled?
Your former comment indicates that you care about page load times, in which case an adblocker will typically reduce both UI yank and certainly network usage, in case you’re constrained.
Last time an ad-blocker caused a multi-hour debugging debacle, that turned out to not be the case. It was preventing me from logging into my bank even when it was supposedly disabled.