What does frontend and backend mean in this context? With graal you can - run wasm interpreted on OpenJDK, similar to javascript running interpreted in nashorn

What does frontend and backend mean in this context? With graal you can - run wasm interpreted on OpenJDK, similar to javascript running interpreted in nashorn, or now graalvm, you just need to add couple of graal sdk jars to your dependencies - run wasm compiled, you need to run on GraalVM for this. This is supposed to provide around 50x speedup compared to previous point