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Reactにおける再レンダリングパフォーマンスチューニングの考え方と実践
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soso
February 16, 2022
Programming
2
390
Reactにおける再レンダリングパフォーマンスチューニングの考え方と実践
soso
February 16, 2022
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Transcript
Reactʹ͓͚Δ࠶ϨϯμϦϯά ύϑΥʔϚϯενϡʔχϯάͷߟ͑ํͱ࣮ફ ˏsoso_15315
ࣗݾհ • χοΫωʔϜ: soso • גࣜձࣾGemcook ϦʔυϑϩϯτΤϯδχΞ • React/Next.js/React Native/GraphQL
• झຯғޟʢ8ஈ͙Β͍ʣ • Twitter: @soso_15315
࣍ • ࠶ϨϯμϦϯά࣌ͷύϑΥʔϚϯενϡʔχϯά͍ͭඞཁͳͷ͔ • Chrome Developer Tools Ͱܭଌ • ύϑΥʔϚϯε࠷దԽ࣮ફ
• ·ͱΊ
͜ͷεϥΠυͰѻΘͳ͍͜ͱ • memo/useMemo/useCallbackͳͲͷઆ໌ • ͬͨ͜ͱແ͍Αͱ͍͏ํʮύϑΥʔϚϯενϡʔχϯά͕Ͱ͖Δ ReactͷAPIʯ͙Β͍ͷೝࣝͰਐΊ͍ͯͩ͘͞ • Context/StateͷҠಈͳͲʹΑΔύϑΥʔϚϯενϡʔχϯά • έʔεόΠέʔεʹͳΓ͕ͪͳͷͰࠓճऔΓѻ͍·ͤΜ
࣍ • ࠶ϨϯμϦϯά࣌ͷύϑΥʔϚϯενϡʔχϯά͍ͭඞཁͳͷ͔ • Chrome Developer Tools Ͱܭଌ • ύϑΥʔϚϯε࠷దԽ࣮ફ
• ·ͱΊ
ύϑΥʔϚϯενϡʔχϯά͍ͭඞཁͳͷ͔ʁ → WebΞϓϦ։ൃʹ͓͍ͯɺ࠶ϨϯμϦϯά࠷దԽʹΑΔύϑΥʔϚ ϯενϡʔχϯά͕ඞཁʹͳΔػձগͳ͍ • Reactࣗମ͕ߴ • εϚϗ/PCͷεϖοΫ͕ेߴ͍ • ཱ͍ͪ͢ॳظදࣔͷվળ͕༏ઌ͞Ε͕ͪ
ύϑΥʔϚϯενϡʔχϯά͕ඞཁʹͳΓ͍͢Օॴ • ແݶεΫϩʔϧ/ԾεΫϩʔϧ • ίϯϙʔωϯτ͕େྔ͔ͭසൟʹߋ৽͞ΕΔ • ϦετͷΞΠςϜ͕ॏ͍ίϯϙʔωϯτʹͳΓ͕ͪ • ॏ͍ΞχϝʔγϣϯͳͲඳըʹෛ୲Λֻ͚Δॲཧ͕͋Δ߹ •
React NativeͰ։ൃ͢Δ߹ • ԾεΫϩʔϧ͕ඞཁʹͳΔ͜ͱ͕ଟ͍ • ϦονͳUIΛٻ͢ΔͱύϑΥʔϚϯε͕Լ͕Δ
࣍ • ࠶ϨϯμϦϯά࣌ͷύϑΥʔϚϯενϡʔχϯά͍ͭඞཁͳͷ͔ • Chrome Developer Tools Ͱܭଌ • ύϑΥʔϚϯε࠷దԽ࣮ફ
• ·ͱΊ
https://chrome.google.com/webstore/detail/react-developer-tools/ fmkadmapgofadopljbjfkapdkoienihi?hl=ja
ϨϯμϦϯά͞ΕͨίϯϙʔωϯτΛ ϋΠϥΠτͰදࣔ ίϯϙʔωϯτ͕ϨϯμϦϯά͞Εͨ ཧ༝Λදࣔ
ܭଌͷखॱ 1. ࣮ࡍʹ৮ͬͯॏ͔ͬͨॴ͔Βେ·͔ͳ͋ͨΓΛ͚ͭΔ 2. Pro fi lerͷϋΠϥΠτػೳͰ࠶ϨϯμϦϯά͕සൟʹൃੜ͍ͯ͠Δ͜ͱΛ֬ೝ 3. Pro fi
lerͷܭଌΛ։࢝ɺΞϓϦΛಈ͔ͯ͠ঢ়ଶΛߋ৽͢Δ 4. ࠶ϨϯμϦϯά͞ΕΔͱPro fi lerʹϨϯμϦϯά͞Εͨίϯϙʔωϯτͱ࣌ؒ ͕දࣔ͞ΕΔ
None
࣍ • ࠶ϨϯμϦϯά࣌ͷύϑΥʔϚϯενϡʔχϯά͍ͭඞཁͳͷ͔ • Chrome Developer Tools Ͱܭଌ • ύϑΥʔϚϯε࠷దԽ࣮ફ
• ·ͱΊ
࠶ϨϯμϦϯάΛ੍͢Δڥք ΛܾΊΔ Listίϯϙʔωϯτͷߋ৽ʹ͍ListҎԼͷίϯ ϙʔωϯτ͕શͯߋ৽͞Ε͍ͯΔ → ListItemΛ memo ͰϝϞԽ͢Δ
࠶ܭଌ ݁Ռͱͯ͠มΘΒͣListҎԼͷίϯϙʔωϯτ͕શ ͯ࠶ϨϯμϦϯά͞Ε͍ͯΔ Pro fi lerͰݪҼΛ֬ೝͯ͠ΈΔͱ onClick ͷ Props ͕
มԽͨ͜͠ͱʹΑΓϨϯμϦϯά͞Εͨ͜ͱ͕Θ͔ Δ → onClick ʹ͍ͯ͠ΔؔΛ useCallback ͰϝϞ Խ͢Δ
࠶ܭଌ ΄΅શͯͷίϯϙʔωϯτͷ࠶ϨϯμϦϯάΛ੍ Ͱ͖ΔΑ͏ʹͳͬͨ Reader Duration 23.2ms → 3.6ms ʹ ʢ࣮ࡍͷܭଌͰฏۉΛऔͬͨ΄͏͕ྑ͍ʣ
࣍ • ࠶ϨϯμϦϯά࣌ͷύϑΥʔϚϯεରࡦ͍ͭඞཁͳͷ͔ • Chrome Developer Tools Ͱܭଌ • ύϑΥʔϚϯε࠷దԽ࣮ફ
• ·ͱΊ
·ͱΊ • Pro fi ler Λۦ͢Δͱ࠶ϨϯμϦϯάͷ֬ೝɾ੍͕͍͢͠ • ࠶ϨϯμϦϯάͷύϑΥʔϚϯενϡʔχϯά͕ඞཁʹͳΔػձ͕͋ Εɺࠓճͷܭଌ →
ରࡦͷखॱΛࢼͯ͠Έ͍ͯͩ͘͞
͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠