The Rust metrics are interesting. I've been getting around 20ms cold starts, 1ms warm exec on the 128MB ARM Graviton2 using Rust for the most basic test cases.

The Rust metrics are interesting. I've been getting around 20ms cold starts, 1ms warm exec on the 128MB ARM Graviton2 using Rust for the most basic test cases. Graviton2 was slightly slower on cold starts than X86 for me (1-2ms) but who doesn't want to save $0.0000000004 per execution? Adding calls to parameter store/dynamo DB bumps it up a little but still < 120ms cold, and any added latency comes from waiting on the external service calls. Memory usage is 20-30MB, and I haven't done anything to optimise memory. I know I can get rid of a few allocations I'm doing for simplicity if I want to. I've not always been the greatest fan of Lambdas seeing it has hidden complexity orchestrating and a blackbox for debugging. Re-visiting a few years on and with Rust, you get an excellent language, excellent runtime characteristics and substantial cost savings unless you really need more than 128MB memory, i.e. processing large volumes of data per execution in memory or transcoding. Any asynchronous/event-driven service I write, I'll just package as a Rust lambda going forward and pay fractions of a cent per month. I am still on-the-wall with HTTP exposed services as that's a big plumbing exercise and hidden gateway costs but not as adverse to it as I was.