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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I am sorry to hear that but I would like to assure you that JotForm has an excellent infrastructure. The slow response is surely not because of our server.
We have millions of user and we hardly hear these kind of issue. Upon your request we can surely delete your account but before we delete your account, I request you to try again. If you don't have any bandwidth issue, clear your browser cache and see if that helps you. You can try to access JotForm with a different browser and see if that makes any difference.
This guide should help you clear your browser cache: http://www.wikihow.com/Clear-Your-Browser's-Cache