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This article explains the iOS app launch lifecycle—including cold and hot starts—details launch‑time optimizations before and after the main function, introduces the fundamentals of virtual memory and ASLR, and provides a practical guide to binary reordering using order files and Clang instrumentation.
This article details the analysis of the iOS app launch process and presents a series of practical optimization techniques—ranging from reducing dynamic libraries and dead code to binary reordering and task concurrency—that together cut Trip.com’s launch time from two seconds to under one second.
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By generating an order file that places frequently executed code contiguously, the authors reduce iOS app cold‑launch page faults by about 15%, achieving roughly a 10% launch‑time improvement without code changes, using runtime hooking and static analysis to build the symbol ordering.
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