Pedal to the Metal

For Q3 of 2018 the main goal for Core Clients team on the iOS front was to dramatically reduce the launch time of the application.

This is a presentation that narrates the story of how we got to slow startup times and goes through the nitty gritty details of how we managed to make the app launch faster (from 5+ seconds to 2- seconds).

Transcript

1. Pedal TO THE METAL Esteban Torres • Core Clients @ SoundCloud • @esttorhe
2. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
3. CONTEXT Esteban Torres • Core Clients @ SoundCloud • @esttorhe
4. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
5. iOS BRANCH Core Clients Esteban Torres • Core Clients @ SoundCloud • @esttorhe
6. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
7. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
8. IMPOSSIBILITY Esteban Torres • Core Clients @ SoundCloud • @esttorhe
9. OVER 5 seconds Esteban Torres • Core Clients @ SoundCloud • @esttorhe
10. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
11. context Esteban Torres • Core Clients @ SoundCloud • @esttorhe
12. APP THEN Esteban Torres • Core Clients @ SoundCloud • @esttorhe
13. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
14. APP NOW Esteban Torres • Core Clients @ SoundCloud • @esttorhe
15. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
16. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
17. MORE CONTEXT Esteban Torres • Core Clients @ SoundCloud • @esttorhe
18. Instruments Esteban Torres • Core Clients @ SoundCloud • @esttorhe
19. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
20. 1. Startup OPERATIONS 2. ViewController 4. PROFIT?? Esteban Torres • Core Clients @ SoundCloud • @esttorhe
21. ! Esteban Torres • Core Clients @ SoundCloud • @esttorhe
22. MAIN THREAD Esteban Torres • Core Clients @ SoundCloud • @esttorhe
23. ! Esteban Torres • Core Clients @ SoundCloud • @esttorhe
24. ! Esteban Torres • Core Clients @ SoundCloud • @esttorhe
25. HOW ABOUT THAT ViewController Esteban Torres • Core Clients @ SoundCloud • @esttorhe
26. EVEN MORE CONTEXT Esteban Torres • Core Clients @ SoundCloud • @esttorhe
27. Mirroring & YOU Esteban Torres • Core Clients @ SoundCloud • @esttorhe
28. ⚡" Esteban Torres • Core Clients @ SoundCloud • @esttorhe
29. WIP Esteban Torres • Core Clients @ SoundCloud • @esttorhe
30. Total pre-main time: 2.0 seconds (100.0%) dylib loading time: 355.67 milliseconds (17.0%) rebase/binding time: 1.3 seconds (63.5%) ObjC setup time: 186.10 milliseconds (8.9%) initializer time: 218.53 milliseconds (10.4%) slowest intializers : libSystem.dylib : 5.52 milliseconds (0.2%) <Redacted> : 51.01 milliseconds (2.4%) MediaServices : 57.60 milliseconds (2.7%) SoundCloud : 182.43 milliseconds (8.7%) Esteban Torres • Core Clients @ SoundCloud • @esttorhe
31. ENTER STATIC FRAMEWORKS Esteban Torres • Core Clients @ SoundCloud • @esttorhe
32. Total pre-main time: 563.45 milliseconds (100.0%) dylib loading time: 111.39 milliseconds (19.7%) rebase/binding time: 151.48 milliseconds (26.8%) ObjC setup time: 148.33 milliseconds (26.3%) initializer time: 152.08 milliseconds (26.9%) slowest intializers : libSystem.dylib : 3.37 milliseconds (0.5%) <Redacted> : 46.06 milliseconds (8.1%) MediaServices : 25.92 milliseconds (4.6%) SoundCloud : 148.34 milliseconds (26.3%) Esteban Torres • Core Clients @ SoundCloud • @esttorhe
33. TAKEAWAYS Esteban Torres • Core Clients @ SoundCloud • @esttorhe
34. 1. PARALLELIZE* * Also with care Esteban Torres • Core Clients @ SoundCloud • @esttorhe
35. 2. INSTRUMENTS is your friend Esteban Torres • Core Clients @ SoundCloud • @esttorhe
36. 3. STATIC FRAMEWORKS* * Also with care Esteban Torres • Core Clients @ SoundCloud • @esttorhe
37. 4. ASSUME NO ill-intention Esteban Torres • Core Clients @ SoundCloud • @esttorhe
38. LINKS > Automatic's blogpost about static frameworks 1 > Keith Smiley's LD python script 2 > CocoaPods 1.5.0 release notes 3 3 http://blog.cocoapods.org/CocoaPods-1.5.0/ 2 https://github.com/keith/swift-staticlibs 1 https://blog.automatic.com/how-we-cut-our-ios-apps-launch-time-in-half-with-this-one-cool- trick-7aca2011e2ea Esteban Torres • Core Clients @ SoundCloud • @esttorhe
39. MULŢUMESC > Github / Twitter: @esttorhe > Mastodon: @esteban@mastodon.technology ! Esteban Torres • Core Clients @ SoundCloud • @esttorhe