Performance

2 measured workloads · Node.js · Apple M4 Pro

Typical processing

5.79 µs

Busier blocks

6.46 µs

Share of the test budget

0.2%

12000-frame PCM16 delay · feedback 0.7 · 48 kHz · 2.667 ms available per block in this test.

Processing cost

Processing time in µs · lower means less work

Select a point to inspect its measurements. Hollow points indicate variable timing. Lines guide the eye; only marked cases were measured.

Timing varied between repeated tests. Treat this case as a guide.

Retained DSP buffers
752.0 KiB
Impulse first arrival
0.00 ms
Peak output
-13.95 dBFS

Captured energy decay

Remaining energy · dB

Stereo-summed backward squared-energy integration, sampled every 20 ms, normalized to the captured 2 s impulse response. Finite-window curve; no extrapolated RT60 claim.
Measurement details
Retained DSP buffers · 752.0 KiB
Unique backing-buffer capacity reachable from prepared DSP state, including borrowed rings and retained scratch. Excludes JS objects, scalar fields, harness buffers and transient allocation; zero does not mean zero total memory.
Peak output · -13.95 dBFS
Last 4096 frames of a 0.5 s steady render. Effects receive a 0.2-peak 1 kHz sine; sources generate their declared waveform. No automatic musical-quality verdict.
DC offset · -0.00041
Signed mean over the same steady-render channels and final 4096 frames.
Output RMS · -19.31 dBFS
RMS over all channels of the same steady-render window.
Impulse first arrival · 0.00 ms
First channel sample at or above -120 dBFS after a 0.2 impulse, following 250 ms + 127 frames of silence; 2 s observation. Includes configured delay, phase and any dry path. Not device latency or group delay. No detection is unavailable, not zero.
Energy after 1 second · -10.41 dB
Energy in the second second relative to the captured 2 s response. A long decay may extend beyond the capture.
All measured cases
Sample rate · kHzWorkloadTypical · µsBusier blocks · µsTest budget usedObservations
485.796.250.2%Timing varies
485.796.460.2%Timing varies

Times are per 128-frame audio block. Test budget used divides the p95 time by the block period at that case’s sample rate. Machine and runtime are shared.

Test setup

Node.js · Apple M4 Pro · 48 kHz · 128 frames per block · 3 repeated tests ·

Typical summarizes the middle measured block times. Busier blocks summarizes the time that 95% of blocks completed within in each repeat. These figures measure DSP processing; application scheduling, loading samples and device output require separate checks. Memory and signal probes run separately from the timing loop.

Lean 4 proofs

No proofs published

No Lean 4 proof is mapped to this node.