AFAIK, it's the same as any other language w/ Ruby. Http micro service, IPC, or FFI. There were some attempts to do inline crystal, like what Mojo does in Pyt

AFAIK, it's the same as any other language w/ Ruby. Http micro service, IPC, or FFI. There were some attempts to do inline crystal, like what Mojo does in Python, but I don't know if any of them became stable long term solutions. There's probably a way to get native C ext speed, you can see an old attempt here: https://www.akitaonrails.com/2016/07/06/trying-to-match-c-based-fast-blank-with-crystal https://www.akitaonrails.com/2016/07/06/trying-to-match-c-ba... But at any rate, it'll be better than ruby.