Google is rolling out a new feature that allows the Google Chrome web browser to automatically unload web ads that use a disproportionate amount of system resources as part of an effort to reduce the browser’s network and CPU footprint. Google is using a thresholds-based system to spot heavy ads, a system that will automatically mark them as causing performance issues if users do not interact with them and if they meet these criteria. Heavy ads are known for ruining users’ web browsing experience by making web pages load slower than normal, draining their devices’ battery, and consuming mobile data for users without unlimited plans.
Source: https://www.bleepingcomputer.com/news/google/google-chrome-starts-blocking-ads-that-slow-down-the-browser/