Chrome's built-in Lighthouse audit will tell you which extensions are adding seconds to every page you open
Before you blame your internet connection, spend half a minute measuring the browser you are reading this in.
Lighthouse is Google's open-source auditing tool, and it already lives inside Chrome: press F12, open the Lighthouse tab, choose Analyze page load, and wait about 30 seconds for a performance score and a list of what slowed the page, including render-blocking scripts, third-party trackers, and extensions getting in the way. Writing at MakeUseOf on August 5, Pankil Shah ran the same pages in a normal window and in an incognito window and found that his own extensions, a pile of ad blockers, cookie-consent dismissers, and a forced dark mode, were costing him roughly four seconds on every page load. He is careful about the method: scores can vary a lot from run to run, so test a few different sites before drawing a conclusion. The repository behind the tool carries 30.6k stars and an Apache 2.0 license, and it runs locally, with nothing beaconed to a remote server.
