The stabilization of the WebAssembly System Interface (WASI) Component Model has created a third runtime pillar alongside bare metal and Docker containers, unlocking sub-millisecond execution for edge serverless functions.
Near-Zero Cold Starts and Capability-Based Security
Traditional operating system containers require substantial user-space overhead, leading to noticeable cold-start latencies of hundreds of milliseconds. WASI binaries, by contrast, execute inside sandboxed bytecode engines that initialize in single-digit milliseconds with memory footprints under 10 megabytes.
Engineers can compile services written in Rust, Go, or Python directly into language-agnostic components, paving the way for ultra-dense, multi-tenant cloud microservices.