Why the forms loading slow when embedded using iframe embed code?

I always copy the iframe code. I had made no changes. The forms stopped loading, then they loaded slow, then they seem to be working atleast for now. I have made no changes.

I have checked a few forms in your account and see that they are loading normally using the direct URL. Could you provide us with the web page URL where the forms are embedded so that we can take a look and assist you further?

We will wait for your response. Thank you!