FastAPI + AWS lambda cold starts?

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  • lambda-warmer-py

    keep lambdas warm and monitor cold starts with a simple decorator

  • I've been using FastAPI in Lambda, and it's working great, but I remember having struggled with low-performing responses, and the key was to turn off the Mangum lifespan (Mangum(app, lifespan="off")). Also, instead of using provisioned concurrency, we ended up using the old-school warming method with something like this

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