Form runs very slow

We have a form that we are trying to create so that we can us it for user account setup. but it turns out that the form we have created is running to slow and crashes sometimes. 

is there an easy way to convert one form in to multi-forms 

We have tested the form on several computers and other devices. both on the same and different networks.

I have inspected your form. It has above 20 pages and about 80 conditions. It should be decreasing the performance of the form. I recommend you divide the form into 4 or 5 parts. You must do this division process with the care of conditions. 
To divide the form, please clone your for 4 times and delete the unrelated fields in each form. 
How to Clone an Existing Form from Your Account
After that, you can connect the parts with changing their "Thank you page". You will redirect the users to the next part accordingly.
Redirecting Users to a Different Page
With this way, you will get 5 different submissions for one form.

How will the data look or be connected at the end? 

Once you divided the forms then the submissions or data will also be divided. Actually, I tested your form and it loads within 30 seconds so I think that's normal considering you have lots of conditional logic to your form.

Note: I only used 3mbps internet connection to load your form, so what more if I used a faster connection, right?

However, if you really want to decrease its load then you need to divide your forms and follow my colleague suggestion.