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FastAPI BackgroundTasks vs Celery for async email sending: Zero-setup fire-and-forget vs distributed queues. Benchmarks show BackgroundTasks add 1.2ms latency for 200ms emails (non-blocking). Celery excels at retries, scaling to 10k+/min. Code examples, Redis setup, when to choose each. Keywords: 'fastapi background tasks celery', 'fastapi async email celery', 'backgroundtasks vs celery fastapi', 'fastapi email background'.
Mar 15, 2026