Instruments 16.3 includes a new Processor Trace Instrument which uses hardware-supported, low-overhead CPU execution tracing to accurately reconstruct execution of the program. This tool provides metrics like duration, number of cycles, and instructions retired for every function executed on the CPU. Timeline in Instruments presents execution flame graph, while detail views provide aggregate-level data like Call Tree or aggregated metrics (min, max, count, sum), divided by function. Traces can be recorded using the new Processor Trace template on supported devices: M4 Mac, M4 iPad, and iPhone 16/16 Pro. Tracing on the device requires additional configuration in the System Settings.