Progressive Web Apps: trick or real magic?
summary
Progressive Web Apps use the Service Worker runtime as a programmable proxy plus the Cache API to make web apps load instantly from cache even when offline. The talk describes runtime caching strategies (stale-while-revalidate, network-first with timeout), helper libraries from the sw-precache/sw-toolbox/Workbox lineage, and using Lighthouse for auditing; an example site rebuilt with these techniques achieved a 99/100 Lighthouse score and preserved timeline, background sync, and installable icon under poor connectivity.
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chapters (11)
- 0:00Introduction
- 2:15Talk title origin
- 3:41Real vs perceived perf
- 13:55Latency deception
- 14:36Why PWAs matter
- 16:20Service Workers explained
- 23:08Caching strategies
- 28:46Real-time updates & notifications
- 31:57PWA tools
- 33:23Lighthouse metrics
- 34:05Conclusion & Q&A
