Hello, we are observing a similar issue to the one you are describing. We are developing and iOS application and notice significant improvement in performance in both CPU usage and fps. This performance improvement is observed when the mentioned Debug executable option is enabled and the application is built locally. Either swipe killing or building without this option results in lesser performance (around 2x slower). I noticed that you mention that your application is running in background. So does ours when we notice the increased performance. When the application is not on background we do not observe any improvements in processing power or CPU usage. We also tried simulating the launch parameters which this option adds in chasing the improved performance but were unsuccessful in doing so.