A user complains about it taking too long to load apps. Another says they like to read the newspaper while they wait for the next web page to appear. Someone else notes that database queries are taking too long.
Such issues are familiar to most data center managers. And the traditional approach to boosting performance is to add more hardware: upgrading memory, deploying the newest generation of servers with the latest processors, or add all-flash arrays. These are smart things to do, and they will almost always make a difference. But they may not stop angry calls from the user community.