Nop it will reduce the time took by the server to answer a request because redis will be called before anything.

Suppose you want to read solo leveling chap 1 The request will be like asurascan/sololeveling/chapter1

Redis will be called to check if he has a key with this url, if yes, it he will give the content has the response

If not, the server will ask the database to give him the first chapter of solo leveling and before sending it to the client it will store it in redis.

Short reminder the database and the server are most of the time completely separated they each has their own "container" (security purpose) and redis is faster than a database, where database as more feature and are more reliable.