You can enable CPU/GPU usage, FPS overlays, Latency info and more for any application by going to developer options and scrolling down to the "GPUWatch" setting. : r/galaxys10
Monitor CPU and GPU Usage and RAM on Android | DroidViews
How to enable show CPU usage nougat 7.0 & 7.1 device
15 Reasons to Unlock Developer Options on Your Android « Android :: Gadget Hacks