LLRT and JavaScript Runtimes on AWS Lambda

AWS has introduced LLRT (Low Latency Runtime), an experimental JavaScript runtime designed to optimize serverless applications on AWS Lambda by significantly reducing cold start times and lowering costs. Unlike general-purpose runtimes like Node.js, LLRT focuses on serverless efficiency, utilizing Rust for a smaller executable size and QuickJS for a lightweight JavaScript engine, resulting in 10x faster startups and 2x lower costs according to AWS benchmarks. However, LLRT's design, which excludes JIT compilation, makes it less suitable for compute-intensive tasks and some API functionalities, positioning it as a specialized tool for serverless environments rather than a direct replacement for Node.js. While LLRT aims to improve Lambda's cost-effectiveness compared to alternatives like Cloudflare Workers, it remains experimental and not recommended for production workloads.