Load/Watt is a small, free instrument panel I built for myself to spot lag and power-hungry code in a page. Drop in an .html file, or point it at a public GitHub repo, and it profiles main-thread busy time, dropped frames, layout shift, and other timing signals exposed by the browser.
It's not a company or a product — just a single page hosted on GitHub Pages, run by one person as a hobby project.
Everything runs in your browser. A dropped file is read and instrumented locally with JavaScript; nothing about it is uploaded anywhere. If you load a public GitHub repo instead, your browser fetches that repo's files directly from GitHub's API and the jsDelivr CDN so the page can render — see the Privacy Policy for details on that.
The "custom process" feature runs JavaScript you type in directly in your own tab, so you can benchmark your own snippets alongside the built-in presets.
Found a bug or have a suggestion? Feel free to open an issue on GitHub.
See the Privacy Policy and Terms of Use for the boring but necessary details.