Performance

Nestelia adds a thin decorator and dependency-injection layer on top of Elysia — with near-zero overhead. The result: NestJS-style developer experience at Elysia-level speed.

1.7x faster than Fastify

1.9x faster than Express

2.3x faster than NestJS

ElysiaBun

74,395 reqs/s

NesteliaBun

71,703 reqs/s

FastifyNode

42,640 reqs/s

ExpressNode

37,825 reqs/s

NestJSNode

30,582 reqs/s

Average reqs/s across 5 scenarios. 500 connections, 10s per scenario. macOS arm64, Bun 1.3, Node 24.

Results by scenario

Scenario	Nestelia	Elysia	Fastify	Express	NestJS
Plain Text GET /	74,914	79,287	47,600	40,385	38,413
JSON GET /json	73,438	76,925	45,010	38,807	36,527
Path Params GET /user/:id	74,289	75,077	45,747	38,250	27,598
POST JSON POST /user	62,399	63,487	29,793	34,038	24,833
DI + Service GET /users	73,476	77,197	45,051	37,647	25,539
Average	71,703	74,395	42,640	37,825	30,582

How to reproduce

# Install benchmark dependencies
cd benchmark && bun install && cd ..

# Install a load testing tool
brew install bombardier

# Run all benchmarks (5 scenarios × 5 frameworks)
bun run bench

# Or run specific frameworks
bun run bench nestelia elysia fastify

Why is Nestelia fast?

Nestelia resolves all dependency injection, module wiring, and route registration at startup time. At request time, simple handlers call service methods directly — no middleware chain, no per-request container lookups, no reflection.

	Nestelia	NestJS
Runtime	Bun	Node.js
HTTP layer	Elysia	Express (default)
DI resolution	Startup-time	Startup-time
Metadata reflection	Cached at startup	Per-request
Request context	Fast path skips it	Always created
Middleware chain	None (Elysia handlers)	Express middleware stack
Validation	Elysia TypeBox (compile-time)	class-validator (runtime reflection)