If there’s one type of activity that really suits the Sony Xperia-specific Small App, it is the system monitor. This is where third-party “System Monitor Small App” comes in. It provides an overlay with a wealth of information about your phone’s CPU clock speed, RAM usage, battery, thermal performance and network speed monitoring. The app allows you to check the performance of your handset whilst playing a game or testing out a new ROM, for example.
The System Monitor Small App provides a number of customisation options including the ability for horizontal or vertical orientation, changing the update rate, start-up at boot as well as the ability to change the colour and order of each monitoring item. If you want to give it a try, head over to the Google Play Store. This is an ad-supported version, but you can support the developer for an ad-free version.