How and why we removed jQuery from GOV.UK - Inside GOV.UK
This is a great thorough description of the process of migrating gov.uk away from jQuery. It sounds like this guide was instrumental in the process—I love that they’re sharing it openly!
Removing jQuery means that 32Kb of JavaScript has been removed from the majority of pages on GOV.UK. GOV.UK is already quite fast to load and for many users this will make no noticeable difference. However, the change for users on a low bandwidth connection or lower specification device will be much more noticeable, resulting in significantly improved page download speed and performance.
