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Reduce Ad JS Blocking Time

Overview

This audit measures the amount of blocking time attributable to ad-related scripts. This captures time where the JS thread is blocked by an ad-related script for long enough to be noticeable by users as it can directly affect input delay or content loading.

Recommendations

The most important factor in ad JS blocking time is how many ads are being loaded at once. Our recommendations are:

More information

To learn how blocking time is defined, see this article on Total Blocking Time

A script is considered to be ad-related if it is either an ad tag or labeled as an "ad" script by Third Party Web.