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DocsoPWA19. Performance Considerations
Reference

19. Performance Considerations

oPWAorravo.com/docs/opwa/19-performance-considerations
  • SW script size: The generated SW is ~8–15 KB before gzip. Keep custom routes minimal.
  • Precache list: Large precache lists slow the SW install. Limit to 20–30 critical URLs.
  • Push payload size: Web Push limits the payload to 4 KB (including the encryption overhead). Keep notification bodies under 1 KB.
  • Analytics beacon: Uses navigator.sendBeacon which is non-blocking. No impact on page performance.
  • Navigation Preload: Enable navigation_preload to avoid SW startup latency on navigation requests. This lets the network request start before the SW is fully ready.
  • Icon generation: GD-based icon generation is a one-time operation. The generated PNGs are cached in uploads/opwa-icons/ and not regenerated unless you trigger it manually.
19. Performance Considerations — oPWA Docs — Orravo