Sidekiq, originally for Ruby, is highly performant due to optimised multithreading and resilience - making it a favourite for scaling massive queue workloads. However, in Python ecosystems, Celery (with correct setup, e.g., prefork, proper broker management) scales well but usually with higher resource use and staging complexity than Sidekiq. For pure Python, Celery is best for scale; but Sidekiq sets the benchmark if language mixing is allowed.
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