- CPU (iOS only)
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Shows the total CPU usage of all of the device's CPU cores in real-time, used by all apps and the operating system.
- DSP
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Measures the time duration that an audio render cycle takes, divided by the buffer duration (the time available to perform rendering). Factors that negatively impact the DSP usage are low latency, the number and sophistication of instrument and effect plug-ins, the number of of simultaneous notes and events, high instrument polyphony, and other apps running in the background.
With Multi-core Processing disabled, rendering is performed on the system’s single ultra high priority audio thread, which means that a DSP peak of 100 % always results in a drop-out (crackling).
When Multi-core Processing is enabled, rendering is performed in engine threads and a short peak of 100 % doesn’t always mean that there is a drop-out, because the engine's buffers might have been able to absorb it. A dropout will only occur if DSP is 100 % for a longer duration than the extra guard buffer can fit.