I think your expierence in a system/framework or programming language is a key factor in "fast" development and to be honest, the question for the "easiest and fastest" framework is totally wrong and you won't get nothing out of this question. All answers will come from people with different expierence levels in programming, frameworks, projects and many other things - all answers are biased towards the expierence of the person who answers your question.

I disagree.

Im primarily a Java monkey, but used django and django REST in a few side projects and was developing much faster. This includes picking up python3 as i went along. The end result was i wished Java had its own version of django.