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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The browser might be having a hard time loading the page because of its length. If you try to loading the worlds longest webpage, you might have a similar message. What browser are you using?
If your form is extremely long I would suggest using the page break field to reduce its length. You can follow this guide for the steps:
Can we have the URL for the form in question so that we can take a look at it and do additional tests?