Comment by straight-shoota

I'm a core developer of Crystal. Crystal's dynamic nature is only in the source code. It generates highly optimized code thanks to LLVM codegen. So performance is generally comparable to other compiled languages like Go, Rust or C. Of course there are differences depending on specific use cases. A workload with lots of memory allocations means a high workload for GC which could be less efficient than an implementation that uses no garbage collection. But even that depends.