6.4 Minification

Introduction:

Make appropriate use of JS dynamic imports so code is only downloaded when it’s actually needed, and bundle and minify all assets as standard practice, this should be a default build step, not an occasional clean-up job.

This sits alongside the wider frontend optimisation checklist: minimise and optimise your JavaScript, and evaluate whether dependencies can be loaded on interaction (a click, a scroll) rather than on page load: see 6.6 for more on that.