A: Thanks for your question! 🙂
On the frontend the plugin only loads a very small JavaScript file — 3.32 KB with no extra dependencies. You can see it here: https://www.awesomescreenshot.com/image/56601080?key=9dc6f0fe6366c81dc56cec10f62b0a6f

The file is loaded at the very end of the page (before </body>), so it doesn’t block rendering and doesn’t affect PSI scores.

So yes, the plugin is really light and fast. 🚀