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1. Why is Redis so fast? The diagram below shows 3 main reasons: 1. Redis is RAM-based. Access to RAM is at least 1000 times faster than access to random disks. Redis can be used as a cache to improve application responsiveness and reduce database load. 2. Redis implements IO multiplexing and single-threaded execution. 3. Several efficient lower-level data structures are leveraged by Redis. By keeping these data structures in memory, serialization and deserialization costs are reduced. Sor...