Curios, if there has been any update here? We have also seen “complaints” from merchants that our script takes long to load because it waits until the full page is loaded and the onload event gets triggered.
It will be great if there is support for the DOMContentLoaded event (https://developer.mozilla.org/en-US/docs/Web/API/Document/DOMContentLoaded_event), especially for tracking-type scripts which don’t leave any visual footprint on the site.