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You will need to run through the FAQ. Your server may need more "beef" or you may need to make some adjustments to PHP vairables.
https://formidableforms.com/knowledgebase-category/frequently-asked-questions/
If you can "component" your application into smaller forms and link them together through a common unique field, you might be able to put together some architecture you can work with. You will then however be dealing with more complex data outputs that you might have to wrap your head around depending on what you are doing with the data collected from the form.