I have seen postgres queries being answerd in low ms range. Why would I want to use redis ? Only if my loadtest suggest that postgres is a bottleneck and redis

I have seen postgres queries being answerd in low ms range. Why would I want to use redis ? Only if my loadtest suggest that postgres is a bottleneck and redis is faster. Keep complexity down to min to make it functionally work. Loadtest and fix the bottlenecks. add complexity when you know the gain.