When to Choose Rust Over TypeScript

Rust and TypeScript solve different problems brilliantly. TypeScript gives you rapid iteration, a massive ecosystem, and full-stack familiarity from JavaScript.

Rust gives you near-C performance, zero-cost safety, and compile-time guarantees that eliminate entire categories of production bugs.

Neither is universally “better.” The move from TS to Rust (or choosing Rust from day one) makes sense only when TS starts hitting hard limits you can no longer ignore. Here’s exactly when that happens, backed by measurable data and observed outcomes.

Performance Where It Actually Matters

Most web apps are I/O-bound (databases, APIs, file reads). In those cases TypeScript/Node is “fast enough”, Express or Bun routinely serves 80–150k req/s.

But the moment your workload becomes CPU-bound, JSON parsing at scale, image/video processing, cryptography, real-time analytics, or heavy business logic, the gap explodes.

Benchmarks consistently show:

• Rust (Axum) handles ~600k req/s on the same hardware where Node/TS tops out at 30–150k.
• CPU tasks: Rust is routinely 10–50× faster and uses far less memory (no GC pauses).
• AWS Lambda example: a Fibonacci (CPU) function was 82× faster in Rust; a DynamoDB…