Surprise! Your app is slow because the speed of light is slow.

Ignite talk at Mobile Delivery Days 2016.

Transcript

1. Surprise! Your app is slow because the speed of light. Clay Smith, New Relic @smithclay Mobile Delivery Days 2016 CC0 wikimedia.org
2. When you release an app... CC0 pixabay.com
3. When you get a review like this... "App slow in the UK. 1 star." -BenedictC CC0 pixabay.com
4. Who owns mobile app network issues? CC0 pixabay.com Backend/Ops Device/ Mobile Devs "Stuff in the middle we don't control"
5. Mobile data growth (simplified) Amount of data Now In a couple years
6. Global Network Latency in Fiber CC0 pixabay.com Source Destination Great Circle Distance RT Time in Fiber SFO London 5,375 mi 84 ms SFO Cape Town 10,124 mi 158 ms 1 ms at speed of light = Length of Massachusetts
7. After one second, your flow of thought is interrupted. CC0 pixabay.com Milliseconds 1 10 100 1000 10000 Not Magic Interrupted Too Late https://www.nngroup.com/articles/response-times-3-important-limits/
8. App services: more cloud, more complexity CC0 openclipart.org REST API Auth - IdP #1 Analytics Ad Network Auth - IdP #2
9. Move it closer? CC0 pixabay.com Datacenter/AZ CDN
10. CDNs on the Edge CC0 pixabay.com Cache static and dynamic content + "uncached origin fetch"
11. #mobileperf Idea CC0 pixabay.com When in doubt, reduce the number of TCP connections.
12. TCP: Use it again CC0 pixabay.com Use HTTP keep-alive to reuse TCP connections.
13. TCP: Create connections faster CC0 pixabay.com TCP Fast Open can speed up opening multiple connections.
14. https://blog.newrelic.com/2016/02/09/http2-best-practices-web-performance/
15. Weighing HTTP/2 CC0 pixabay.com multiplexing, compression Hard to debug, backend support?
16. What dial do we turn (if any)? CC0 pixabay.com
17. Premature optimization is the source of all evil. -Donald Knuth in 1974 CC0 pixabay.com Don't touch that dial. (yet)
18. CC0 pixabay.com Measure often to understand what matters.
19. CC0 pixabay.com Measure network latency and connect it to U/X
20. Building connected mobile apps is hard. Monitoring shouldn't be. Thanks! Clay Smith, New Relic @smithclay Mobile Delivery Days 2016 CC0 wikimedia.org