3: Explains how load time can be improved using a PWA. 2: Outlines some features of a PWA and/or issues affecting load time. 1: Some relevant information.

A progressive web app (PWA) can improve load times by pre-caching important resources, allowing files such as image-gallery.js and video-gallery.js to be loaded into memory or cache while the rest of the page loads. PWAs also use service workers to cache resources, ensuring faster load times on repeat visits and offline functionality. Background synchronisation and background fetching can update content in the background, so users see the latest information without slowing down the initial load.