Indeed 
A complement of that Why is Crystal language faster than Ruby language? - #4 by nico
Yes, it’s a productivity killer. I migrate the project 1 which is in early stage.
Project 2 is too advanced so we continue as is for now.
Project 1
- Time to compil (dev): about 10 seconds
- LoC: 1519 lines
- Lib directory: 39 shards (LoC: 105345 lines)
Project 2
- Time to compil (dev): about 20 seconds
- LoC: 13264 lines
- Lib directory: 26 shards (LoC: 74058 lines)