What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Upon checking your form, I see that you've enabled the autofill settings in it which can cause this performance issues on large forms.
If you don't need this feature please disable it or configure it to auto save every 30 seconds and uncheck the "Save data on changes" checkbox.
Let us know if this helps.