Fusillade

What it does

Existing load tools mix network latency with their own scripting overhead, so your p99 is partly theirs. Fusillade separates them: a Rust engine on real OS threads measures network time only, while you script in TypeScript or JavaScript with full IDE types. One binary covers HTTP/1.1, HTTP/2, WebSocket, gRPC, MQTT, AMQP, SSE, and headless browsers.

Load testing without the lazy tax. Script in JavaScript, execute in Rust. 10x faster than k6, distributed across 32 global regions.

Script in JavaScript . Execute in Rust . The world's most efficient load testing engine. 180K RPS with sub-millisecond latency on just 200 workers. Benchmarked on localhost against a Rust/Axum server with 200 workers for 30 seconds. Real-world results will vary based on network latency and server complexity. Traditional load testing tools are built on garbage-collected runtimes. At high concurrency, GC pauses introduce latency spikes that pollute your metrics. Fusillade eliminates this with zero-allocation hot paths and predictable memory usage. Each worker runs as a lightweight green-thread coroutine with its own QuickJS runtime. 50,000 workers share just 16 OS threads with zero-cost…from fusillade.io

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