Hi again
For the repeating groups, but there will always be some loading time. I’d love to help more, but it’s hard without knowing a lot more specifics. To use best practice for speedy loading, I recommend really studying this thread, it explains a lot on how Bubble loads and writes data, and how you can use it efficiently: Performance Q&A guide
For the changed URL parameters, this article should get you started: https://bubble.io/reference#Elements.Link.add_parameters