Because Rust doesn't have a runtime initialization.

Rust AWS Lambda Runtime author here: while the Rust runtime tends to beat all other runtimes, Go is _very_ close in terms of startup times.

this? https://aws.amazon.com/blogs/opensource/rust-runtime-for-aws...

https://github.com/awslabs/aws-lambda-rust-runtime

https://crates.io/crates/lambda_runtime

you rock! That docker based build system makes building those MUSL based rust binaries a snap!

Yep! Thank you so much! I really need to update the documentation, but I think `cross` (https://github.com/rust-embedded/cross), a drop-in cargo replacement, is the probably the best available solution for building musl-based binaries.

I've struggled with this before, will have to take a look at it.