At the end of this chapter, you have all the keys you need to enhance your application performance. We saw how to send the right data to a browser to not have to load cached data, how to set up a cache using Java EE API (JCache), and the caching challenges you need to think about to not decrease the performance.
Being able to cache data in a distributed system is important, since any network call is very impacting on performances. Now that we know how to cache, we can go to the next level about distributed systems and see how to control the performance in a wider system. This is what our next chapter will be about—how to be fault-tolerant and avoid impacting all the applications of a system when one is starting to fail or running slower than usual.