Performances
requake scan_catalogis designed to fully utilize available CPU cores by processing earthquake pairs in parallel. On an M2 MacBook Air, scanning 95,034 earthquake pairs downloaded via FDSNWS took approximately 5 minutes using 7 worker processes, yielding ~19,000 pairs per minute. When repeating the same scan with a fully cached set of waveforms, runtime dropped to 84 seconds (~68,000 pairs per minute). These results indicate that overall performance is typically dominated by waveform download latency rather than computation.For large FDSN-based runs, use
requake wfcache prefetchbeforerequake scan_catalogto download all waveforms upfront into a local SQLite cache. This eliminates repeated downloads, lets the scan read exclusively from disk, and is the single most effective way to speed up catalog scanning.requake build_familiesis fast™.