Noteflakes: A Compositional Approach to Optimizing the Performance of Ruby Apps — the idea is to offload “inner-loop”-type operations from Ruby to C-extensions. The clever twist is this happens via data-structure-as-language. Ruby being Ruby, you can wrap a DSL around the data structure generation to reduce the context switch from Ruby to offloaded operations.
There’s precedent to the approach: if you squint, it’s not unlike offloading the math for computer graphics or machine learning to a GPU. That said, the speed-up is unlikely to be as dramatic.
I hope to hear more of this approach in the future!