[npn]

well one of the weakest point of crystal is it's slow compiling time. A full-featured framework for crystal looks nice on paper, but after your app grow it will become a hinder instead, solely for the additional compiling time overhead of all the nice features the framework provided.

It hurts my productivity so bad I have to split the code base to multi independent services, each one use a simple server to serve some part of the system. After this those frameworks just cease to being helpful.