App_Startup_TIme_Past_Present_Future.md

WWDC 2017

Table of Contents

• App Startup Time: Past, Present, and Future - Friday
  • Improving App Startup Time
  • dyld 3
    • Why ?
    • How ?

App Startup Time: Past, Present, and Future - Friday

Session video and resources: https://developer.apple.com/videos/play/wwdc2017/413/

Improving App Startup Time

• Do less !
  • Embed fewer dylibs
  • Declare fewer classes/methods
  • Use fewer initializers
• Use more Swift !!!!
  • Swift avoids most of the pitfalls
  • Swift size improvements
• Static initializer tool from instruments to check app startup time

dyld 3

Why ?

• Performance
• Security
• Reliability

How ?

• Move complex operations out of process
• Make the rest of dyld as small as possible
  • Speeds up launch
  • Reduces attack surface