fastapi-lazyrouter is an open-source Python library that optimizes FastAPI application startup by dynamically mounting routers only as requests come in. It helps developers reduce cold start times, especially for large apps with many Pydantic models, and preserves API documentation loading. Ideal for developers deploying FastAPI on platforms with strict startup time limits.
In the Frameworks & SDKs space, fastapi-lazyrouter takes a focused approach. It focuses on reducing cold start times for FastAPI applications with many Pydantic models. fastapi-lazyrouter is an open-source project aimed at python web developers using FastAPI. The project is open source (MIT). It runs on the command line and API, and it can be self-hosted.
Behind fastapi-lazyrouter is Fabien Arcellier, and the product first shipped in 2026. The project is developed in the open on GitHub with 5 commits in the last 90 days. Among its 5 catalogued features are lazy router loading, faster startup, and minimal overhead.
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