Bundles grow until every page downloads, parses and runs code for features it never shows. Parsing and executing JavaScript costs processor time on every visitor's device.
The fix you can use today
Code-split so each page loads only what it uses.
Tree-shake and remove unused libraries; check for duplicate copies.
Load third-party tags only when needed, for example after consent.
GreenCode researchers list big JavaScript bundles as a waste. GreenCode's own site loads scripts only where they are needed.
Tools that help
GreenCode Constitution skill (GreenCode researchers): open-source energy principles and a catalogue of 37 energy anti-patterns that an AI coding agent can follow to find and fix waste like this
Lighthouse: audits a page for total byte weight, unused JavaScript and CSS, image formats and offscreen images
WebPageTest: loads a real page and shows every request, its size and when it loaded
How GreenCode helps
GreenCode helps tackle this by loading scripts on greencode.ai only on the pages that use them. With WebP images, purged styles and one self-hosted font, that cut the home page's first view from 80 requests to 33. More on this.
