Redis, known for its speed, can be used to manage multiple databases on a single instance, reducing administrative overhead. However, this approach can lead to performance issues due to Redis' architecture, which uses a single thread to eliminate context switching and blocking. A benchmarking tool was used to demonstrate the impact of shared instances on performance, showing that throughput, latency, and response times decreased significantly compared to dedicated instances. The study concludes that using dedicated Redis instances is recommended for real-world purposes, as they avoid inter-database blocking and allow for configuration of different data persistence and eviction policies for each database. Additionally, considering Redis' shift away from shared instances, it's advisable to stop using them regardless.