Submitted by val in freeAsInFreedom

"Firefox Quantum – version 57 – introduced number of changes to the network requests scheduler. One of them is using data of the Tracking Protection database to delay load of scripts from tracking domains when possible during the time a page is actively loading and rendering – I call it tailing.

This has a positive effect on page load performance as we save some of the network bandwidth, I/O and CPU for loading and processing of images and scripts running on the site so the web page is complete and ready sooner."

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