Will JotForm Version 4.0 result in....

Will Creating new forms within Version 4.0 result in the forms underlying code/platform being different than Vs3.0? Meaning... if you have two identical forms, one created under version 3.0, the other created within version 4.0, will the form created under version 4.0 be "leaner" with regard to the underlying code/platform?... will forms created under 4.0 render faster, are they being housed on more modern/faster back-end servers, etc. etc.

Long & short of my questioning is... should I begin "RE-CREATING" from scratch my more important forms under the new version 4.0?

The forms created in V3 will work the same in V4, and will not be less effective that the ones created in V4. So, there is no need to recreate your important forms in V4. Let us know if you have more questions.