If you are doing a performance test in your system before rolling it out to users, you are measuring the system based on assumptions. It’s a good start but what happen next? Do you invest in another tool / solution to ensure the system is running as expected?
Consider investing in application performance monitoring tool that can help you do performance test before you roll-out your system and also continuous monitoring and automated tuning. This will also allow you to rollout your system in smaller scale and optimize as you go instead of investing heavily at one go. Start small and adopt continuous improvement is a methodology that organization should take.