Rust SIMD & Purego Dynamic Architecture
How GoRoute achieves 0.86ms dispatch latency and < 5MB memory footprint using Pure Go, Purego dynamic linking, and vectorized Rust SIMD kernels.
1. Zero CGO Architecture
Traditional Go applications linking to C or Rust libraries rely on CGO. However, CGO introduces substantial runtime overhead: thread context switching, bloated binary sizes, and complicated cross-compilation across platforms.
GoRoute runs with CGO_ENABLED=0 everywhere. Dynamic loading of the optional Rust acceleration library (goroute-fast.so / .dylib / .dll) is executed at runtime via ebitengine/purego, which invokes dynamic library symbols using pure assembly stubs.
2. Vectorized SIMD Fast Path (crates/goroute-fast)
During high-concurrency coding agent sessions (e.g. Claude Code issuing multi-megabyte codebase snapshots), scanning tokens and parsing JSON ASTs creates memory garbage collection spikes in Go.
GoRoute offloads token scanning and byte-level payload filtering to a native Rust cdylib utilizing 256-bit AVX2 (x86_64) and 128-bit NEON (Apple Silicon / ARM64) vector instructions:
# Compiling the optional Rust acceleration cdylibcd crates/goroute-fast && cargo build --release# GoRoute automatically detects and links target/release/libgoroute_fast.* on startup
3. Empirical Memory Benchmark
| Metric | OmniRoute (Node) | LiteLLM (Python) | GoRoute (Go+Rust) |
|---|---|---|---|
| Idle Memory | ~380 MB | ~420 MB | 4.7 MB |
| Routing Latency | 18.4 ms | 24.1 ms | 0.86 ms |
| Cold Boot | 3,200 ms | 2,800 ms | 11 ms |