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App Startup Time: Optimization & Monitoring Daiki Matsudate,@d_date, iOS Freelancer Developer SWWDC x AKIBA.swift in Sendai

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Daiki Matsudate,@d_date • iOS Freelancer • Supporting Realm as News Translator • Organizer of CLEM • WWDC17 Attendee

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SWWDC

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WWDC

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WWDC17

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WWDC17 • Back to San Jose • Over 3,000 attendee • Over 200 sessions / labs / events

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Sessions • Frameworks • Design • Developer Tools • Distribution • Featured • Graphics and Games • Media • System Frameworks

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Developer Tools Localizing Swift Debugging Xcode9 Github Undefined Behavior Playgrounds Testing LLVM Interface Builder App Startup Time Testability

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Developer Tools Localizing Swift Debugging Xcode9 Github Undefined Behavior Playgrounds Testing LLVM Interface Builder App Startup Time Testability

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Recognition • ը૾ͷࢹೝ … 13ms • ϑΥʔΧεઌͷܾఆ…100 - 140ms • ૢ࡞͕ྲྀΕʹ৐͍ͬͯΔ…200 - 1000ms • ڵຯͷର৅͕ଞʹҠΔ… 1000 - 10000ms • ؔ৺͕ࣦΘΕΔ … 10000ms - 2014 MIT Research

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Recognition • ը૾ͷࢹೝ … 13ms • ϑΥʔΧεઌͷܾఆ…100 - 140ms • ૢ࡞͕ྲྀΕʹ৐͍ͬͯΔ…200 - 1000ms • ڵຯͷର৅͕ଞʹҠΔ… 1000 - 10000ms • ؔ৺͕ࣦΘΕΔ … 10000ms - 2014 MIT

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App Startup Time • Do less! • Embed fewer dylibs • Declare classes/methods • Use fewer initializers • Use more Swift • No initializers • Swift size improvements

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Monitoring • In Development • Use DYLD_PRINT_STATISTICS • Initializer Calls • After Release • Firebase Performance Monitoring How to

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Initializer Calls • Available on iOS 11 and macOS High Sierra • Provides precise timing for each static initializer • Available through Instruments

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Initializer Calls Demo

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Firebase

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• Google I/O 2017 Ͱൃද • iOS / Android ྆ରԠ Firebase Performance

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• ΞϓϦىಈ࣌ؒ, HTTP/S network requestͳͲΛ ࣗಈͰܭଌ • ΞϓϦͷύϑΥʔϚϯεͷվળՕॴ͕Θ͔Δ • ΞϓϦʹ߹ΘͤͯܭଌΛΧελϚΠζͰ͖Δ Firebase Performance

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Firebase Performance Install pod ‘Firebase/Monitoring’ Podfile

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Firebase Performance Demo

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Summary • fewer dylibs, classes/methods, initializer • Use more Swift • App startup time monitoring • Use DYLD_PRINT_STATISTICS • Initializer Calls - Instruments (iOS 11~) • Firebase Performance Monitoring

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Resources App Startup Time:Past, Present, and Future WWDC 2017 Optimizing App Startup Time WWDC 2016 Firebase Performance Monitoring

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SWWDC x AKIBA.swift in Sendai