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Local, synchronous evaluation
SDKs evaluate flags locally, synchronously, in-memory with no network latency. This includes flag logic that contains A/B tests, machine learning loops and event logging.
So you can use an SDK on the backend to evaluate flags, including A/B tests, for different users without adding latency to every request.
And you can use an SDK on the frontend to evaluate flags, including A/B tests, without blocking renders.