Classic Form iframe takes 2–3 seconds to become visible despite loading quickly

Issue Description I'm reporting this in the hope that the GiveWP team can improve the iframe loading behavior for the Classic Form. Currently, the donation form displays a loading spinner for around 2–3 seconds before becoming visible, even though the form itself loads almost instantly when accessed directly. It appears that GiveWP unnecessarily keeps the iframe hidden while waiting for JavaScript initialization to complete, making the form feel significantly slower than it actually is. I managed to improve the experience using the CSS workaround below, which removes the initial spinner, makes the iframe visible immediately, and prevents temporary scrollbars during loading. CSS Workaround The 3000px minimum height works for my setup but may need adjusting depending on the form. Requested Improvement It would be great if the GiveWP team could update the Classic Form's iframe loading logic so that: • The form becomes visible as soon as its content is available…