Automapper is going commercial

Pricing model is not yet finalized, More details can be found here.
LuckyPennySoftware/AutoMapper#4536

Possible High Performance Alternatives
Mapster:
https://github.com/MapsterMapper/Mapster

Mapperly:
https://github.com/riok/mapperly

Also we can consider making a fork of Automapper until its license is changed

Or simple extension methods with handwritten code.