I’m having the same issue with NF version 3.1.2 and WP version 4.7.5; after adding about 6 elements to a new form, the builder becomes so slow that it becomes unusable and eventually crashes. This isn’t the first time that I’ve had this issue, and across different hosts and builds. I’ve even tried rolling back to 2.x but the import form function is completely broken, I used to enjoy using NF before NF3 but I think I’ll stick to using their other major competitor going forward.
