With the development of cloud computing, Internet of things and big data technology, the cache technology has been introduced into the modern Web system because of the huge amount of data and high concurrency, which reduces the load pressure on the server end caused by the direct access to the relational database, improves the response efficiency of the database server and reduces the delay of the browser. Redis is widely used in modern Web systems because of its high-performance distributed memory cache technology. This paper will analyze the reasons for the high performance of Redis through the experimental data, and put forward corresponding strategies for Redis performance optimization from different angles based on experimental data, so as to better improve Redis user experience.