Test with a heavy page, not your homepage. Load a large news site or a forum with many third-party widgets and count how long it takes before and after. That is where a content blocker earns its place, not on a clean personal blog. This is the practical case for ad blocker.
Not every annoyance is an advertisement. Pop-ups that hijack the screen, invisible trackers that follow you between sites, and scripts that quietly load from unknown domains are all part of the same problem. Judge a blocker by whether it handles all of them, not just banner ads. That is the whole discipline behind ad blocker, really.
Log in to your bank and your email once after installing, and confirm they still work. A well-built blocker leaves first-party content alone; if a site misbehaves, disable the extension for that domain rather than removing the app entirely.
On-device processing is the standard to look for. Rules that run locally mean your browsing history never leaves the phone, and there is no server that has to see every URL you visit. Check the app's privacy label before you trust it with your traffic. Get the basics right and ad blocker never lets you down.
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