All depends what performance metrics you're comparing, there are plenty of data points in this article showing ad blockers slowing down the browser experience, typically on pages that aren't ad-hell. That being said for pages that are ad-hell (typical news sites are a perfect example) an adblocker prevents loading 90% of the site content so is still faster than not. For a page that's 90% not-ad-content it results in a slower experience. The latter gives particularly bad results for ad-blockers in benchmarks.
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All depends what performance metrics you're comparing, there are plenty of data points in this article showing ad blockers slowing down the browser experience, typically on pages that aren't ad-hell. That being said for pages that are ad-hell (typical news sites are a perfect example) an adblocker prevents loading 90% of the site content so is still faster than not. For a page that's 90% not-ad-content it results in a slower experience. The latter gives particularly bad results for ad-blockers in benchmarks.
All depends what sites you compare.