@tony-jacob I have just tested it, on my side the form appears on the page after 5 seconds
My guess is the form is loading tons of JS/code inside the Iframe and that explains why the IFRAME takes 5 seconds to load.
I've also checked quickly your page and I can see an unclosed SCRIPT tag in the source code of your page, and also several JS errors from an external service "Matomo"
5b0e0d8b-6d27-45bd-9bc9-92654b4cedbe-image.png
Those are slowing down execution of JS on your page, so I recommend you to fix those errors