Chrome began to include a resource-intensive ad blocker

Google company start phased activation for Chrome 85 users of the mode of blocking resource-intensive ads that consume a lot of traffic or heavily load the CPU. The function is enabled for the control group of users and if no problems are identified, the percentage of coverage will gradually increase. It is planned to fully bring the blocker to all users during September. You can test the blocker on a specially prepared website heavy-ads.glitch.me. You can use the "chrome://flags/#enable-heavy-ad-intervention" setting to force activation or deactivation.

New blocker disconnects iframes with ads if the main thread consumes more than 60 seconds of CPU time in total or 15 seconds in a 30-second interval (consuming 50% of the resources for more than 30 seconds). The blocking will also take effect when an ad unit downloads more than 4 MB of data over the network. The blocking works only if the user did not interact with the ad unit before the limit was exceeded (for example, did not click on it), which, taking into account the traffic limit, will block autoplay of large video ads without explicitly activating playback by the user.

Once the limits are exceeded, the problematic iframe will be replaced with an error page informing the user that the ad unit has been removed due to excessive resource consumption. Typical examples of ad units to be blocked include interstitials with cryptocurrency mining code, large uncompressed image handlers, JavaScript video decoders, or scripts that process timer events intensively.

The proposed measures will save users from advertising with inefficient code implementation or deliberate parasitic activity. Such ads create a heavy load on the user's systems, slow down the loading of the main content, reduce the battery life and consume data on limited mobile tariffs.
According to Google statistics, ads that meet the specified blocking criteria make up only 0.30% of all ad units. At the same time, such advertising inserts consume 28% of CPU resources and 27% of traffic from the total amount of advertising.

Source: opennet.ru