Developing Mobile Apps for Performance - Swapnil Patel, Verizon Media
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This document discusses developing mobile apps for performance. It emphasizes that user perceived latency, stability, and battery life matter most to users. A key performance indicator is cold app launch time, which should be under 2 seconds to keep users happy. Measuring app performance is challenging as it needs to account for different devices, networks, and conditions. The document recommends reducing network calls to load the home screen faster by fetching content in the user's viewpoint with a single endpoint and network call.
Developing Mobile Apps for Performance - Swapnil Patel, Verizon Media
- 1. Developing Mobile Apps for Performance Swapnil Patel, Director of Software Engineering (Mobile), Verizon Media February 21st, 2019
- 2. 2 Users are complaining...but I did my job! ● I’m losing my DAUs but the app works perfectly. ● Performance tests passed 100% but user feedback is negative. ● Are we measuring performance KPIs correctly?
- 5. 5 What matters to users?
- 6. 6 ● Latency (User perceived) ● Stability ● Battery App Performance
- 7. 7 User perceived latency: Cold app launch
- 8. 8 Why is it taking so long to launch content?
- 9. 9 Cold app launch...keep it under 2000ms! < 1500 ms I love this app! > 1500 ms && < 5000 ms It should work! > 5000 ms I’m done with this app!
- 10. Users may stop using your app without sharing any negative feedback
- 11. Measuring App Launch Performance
- 12. 12 Measuring app performance isn’t easy ● Hard to test and simulate real world scenarios ○ Controlled environment ○ High-end devices ○ Test hardware on low latency networks - test machines and devices ○ Did you simulate 3G/4G network and real-world conditions? ● Needs continuous auditing ○ Different network bandwidth levels ○ Device capabilities ○ Regions or geo-locations
- 13. 13 App performance KPI: Cold App Launch (iOS) Credit: Devrim Tufan (Verizon Media), Scott Tury (Verizon Media)
- 14. 14 App performance KPI: Cold App Launch (Android) We want to report cold_start_display = Δdisplay with breakdowns cpuElapsedTime appCreateDelta appCreateActCreateDelta actCreateStartDelta actStartResumeDelta actResumeDisplayDelta Most apps report cold_start_* = Δd1 + Δd2 + Δd3 Credit: Devrim Tufan (Verizon Media), Scott Tury (Verizon Media)
- 15. Fine-tuning App Launch Performance
- 16. 16 What’s one thing I wish I knew before? Fetch content in the user’s viewpoint with a single end point.
- 17. 17 What’s one thing I wish I knew before? Fetch content in the user’s viewpoint with a single end point. Reduce the number of network calls to load your home screen faster.
- 18. 18 ○ App cache ○ Background prefetch ○ Silent notifications ○ Network layer optimizations ○ User feedback (spinners, animations…) Nice to have…
- 19. Fetch content in the user’s viewpoint with a single end-point, single network call.
- 20. 20 Thanks!
- 21. Reach out Swapnil Patel Director of Software Engineering, Verizon Media swapatel@verizonmedia.com @patelsince1981 LinkedIn