Optimized Assets Loading is a test that aims to optimize a website’s front end performance by only loading the functionality that the page requires. This experiment defaults to loading less code, which results in much faster page load times and higher page speed scores.

This can result in significant JS file size reduction by loading elements of the infrastructure JS code only when needed on the page.

Furthermore, by breaking down the loading technique into small parts, users of HTTP/2 sites will benefit from faster loading thanks to multiplexing, which allows a browser to request all files at the same time. As a result, there is a significant increase in performance.