JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Can you please provide URL of your website so that we can inspect your code. Maybe you are using script block(source code) for embedding your form on website. We recommend using of iFrame code. You can try to replace source code with iFrame to see if the form will load faster. In this article you can find out how to do it.
Hope this will help.