Diagnose and fix slow iOS app launch time
WHAT IT TESTS: understanding launch phases and profiling. OUTLINE: pre-main covers dylib loading, rebasing, and static initializers; main covers didFinishLaunching and first frame; profile with Instruments, then defer work, reduce dynamic libraries, and trim…
WHAT IT TESTS: whether you can break launch into measurable phases and optimize the right one. ANSWER OUTLINE: pre-main includes dyld loading and linking dynamic libraries, rebasing and binding pointers, and running static initializers and +load methods; main covers application(_:didFinishLaunchingWithOptions:) through the first rendered frame; diagnose with the App Launch template in Instruments and the DYLD_PRINT_STATISTICS signpost; then reduce dynamic frameworks, defer non-critical work, and lazy-load.
Read the original → interview
- #ios
- #performance
- #launch-time
- #dyld
- #instruments
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