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It will excise only the worst ad offenders, including those that consume more than 4 megabytes of network data and those that occupy the browser’s main computing process for more than 60 seconds total or for 15 seconds of any 30-second period
If an ad is using too many resources, Chrome will show an error page in the frame where the ad would have been shown.
According to Google, “Chrome will block ads on the threshold: 4MB of network data, 15 seconds of CPU usage in any 30-second period, or 60 seconds of total CPU usage. Only 0.3 percent of ads surpass those thresholds, but the ads that do account for 27% of network data used by ads and 28% of all ad CPU usage,”