Core Web Vitals についてあれやこれや

by Masayuki Maekawa

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$PSF8FC7JUBMT   ʹ͍ͭͯ͋Ε΍͜Ε΍ ߹ಉษڧձJOେ౎ձԬࢁ4VNNFS0OMJOF લ઒ণ޾

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֓ཁ ͜ͷय़ɺ ΢Σϒք۾ͰԿ͔ͱ࿩୊ΛूΊ͍ͯͨ$PSF8FC7JUBMT $87 ɻ (PPHMFͷݕࡧ݁ՌͷϥϯΩϯάཁҼʹՃ͑ΒΕΔ ͱ͍͏ ͜ ͱͰɺ   ͍ΘΏΔ4&0ͷਓ͚ͨͪͩͰͳ͘ɺ ΢Σϒ੍࡞ͷਓͨͪ ΋݌݌ᨣᨣͰͨ͠ɻ Φ ϛ ΧϨ΋ ͝ଟ෼ʹ࿙ΕͣରԠΛߦ͍· ͨ͠ͷͰɺ   ͦͷৼΓฦΓతʹΞϥΧϧτͰ঺հ͠ ·͢ɻ

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ࣗݾ঺հ w લ઒ণ޾ ʢ· ͔͑Θ· ͞Ώ͖ʣ w גࣜձࣾɹΦ ϛΧϨ w %FWFMPQNFOU%JSFDUPS w 'SPNPLBZBNBKT

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ࠗ׆ͱ͍͑͹Φ ϛ Χ Ϩ

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$PSF8FC7JUBMT $87 IUUQTEFWFMPQFSTKQHPPHMFCMPHDPNXFCWJUBMTIUNM

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͢΂ͯͷ΢ΣϒΤΫεϖϦΤϯεʹͱ ͬͯ   ॏཁͳڞ௨γάφϧɺ   ͭ· Γ ʮ$PSF8FC7JUBMTʯ

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೥݄Α Γɺ ϥϯΩϯάཁҼʹ IUUQTEFWFMPQFSTHPPHMFDPNTFBSDICMPHNPSFEFUBJMTQBHFFYQFSJFODF

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ࠓճͷߋ৽͸༏Εͨ   ϢʔβʔΤΫεϖϦΤϯεΛఏڙ͢Δ   ϖʔδΛϋΠ ϥΠ τ͢Δ Α ͏ʹ   ઃܭ͞Ε͍ͯ·͢

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ϖʔδΤΫεϖϦΤϯε͸ɺ   (PPHMFͷγεςϜ͕ߟྀ͢Δ   ଟ͘ ͷཁૉͷ͏ ͪͷͭͰ͢ɻ   ͦͷͨΊɺ Ұൠతʹ͸αΠ τʹ   େ෯ͳมԽ͕ى͜ ΔΘ͚Ͱ͸͋Γ ·ͤΜɻ

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ޚଟ෼ʹӮΕͣɺ   Φ ϛ ΧϨ΋ରԠΛ͠ · ͨ͠

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ͨͿΜօ͞Μ͕ฉ͖͍ͨ͜ ͱ

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ରԠͯ͠ॱҐ্͕ͬͨ ʁ

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͓౴͑͠ ·͢

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ʮ͜ΕͰ্͕ͬͨʯ   ͱ͍͏ೝࣝ͋ Γ ·ͤΜ

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͜ͷࠒͷಈ͖ w ݄ ɿ $87ͷϥϯΩϯά൓ө w ݄ ɿ ίΞΞ ο ϓσʔ τ w ݄ ɿ ίΞΞ ο ϓσʔ τ

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͜ͷࠒͷಈ͖ w ݄ ɿ $87ͷϥϯΩϯά൓ө w ݄ ɿ ίΞΞ ο ϓσʔ τ w ݄ ɿ ίΞΞ ο ϓσʔ τ ίΞΞ ο ϓσʔ τͷӨڹ͕ᴴ͔ʹେ͖ ͘ɺ ଌఆෆೳ

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$73ͱ্͔͕ͬͨͷ ʁ

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ίϩφͷӨڹ͕େ͖͗ͯ͢ɺ   قઅࢦ਺΋ݟ͑ͣΘ͔Βͳ͍ ʢٽ

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Ͱ΋ɺ ΍͓ͬͯ͘΂͖ɺ ͱࠓ΋ࢥͬͯ·͢

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Ͳ͏͍͏ରԠΛ͔ͨ͠ʁ

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$PSF8FC7JUBMTͷ߲໨ w -BSHFTU$POUFOUGVM1BJOU -$1 w 'JSTU*OQVU%FMBZ '*% w $VNVMBUJWF-BZPVU4IJGU $-4

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-BSHFTU$POUFOUGVM1BJOU -$1 w ϖʔδ͕࠷ॳʹϩʔ υΛ։࢝ͨ͠ͱ ͖ ͱ͔Βɺ   Ϗϡʔϙʔ τ಺ʹදࣔ͞ΕΔ࠷େͷ   ը૾·ͨ͸ςΩε τ ϒϩοΫͷϨϯμϦ ϯά࣌ؒ w ͍Θ͹ɺ ϖʔδͷදࣔ଎౓

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'JSTU*OQVU%FMBZ '*% w Ϣʔβʔ͕࠷ॳʹϖʔδΛૢ࡞͔ͯ͠Βɺ   ϒϥ΢βʔ͕࣮ࡍʹॲཧΛ։࢝Ͱ͖ ΔΑ ͏ʹͳΔ ·Ͱͷ࣌ؒ w ͍Θ͹ɺ 6*ͷ൓Ԡ଎౓

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$VNVMBUJWF-BZPVU4IJGU $-4 w ϖʔδͰൃੜ͢Δ༧ظ͠ͳ͍ϨΠ Ξ΢ τγϑ τͷଌఆ஋ w ͦͷͭ΋ Γແ͍ͷʹ޿ࠂͱ͔Λλ ο ϓͯ͠͠ · ͏Ϡπ

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ͦΕͧΕͷରԠ޻਺ -$1$-4'*% '*%ʹ͍ͭͯ͸ಛʹରԠͷඞཁͳ͔ͬͨ $-4ʹ͍ͭͯ͸ϖʔδදࣔޙͷࠩ͠ࠐΈίϯςϯπΛॳظදࣔʹ ˞Φ ϛΧ Ϩͷ৔߹

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-$1ରԠ w ج४͸ඵҎԼ w ໨ඪ͸ඵҎԼ w ରԠલ͸ඵ୆ɺ ͞ Βʹ஗͍৔߹΋

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1BHF4QFFE*OTJHIUT͕ग़ͯ͘͠ Δ਺ଟͷରԠ߲໨ άάͬͨΒग़ͯ͘ ΔରԠํ๏ ίϯαϧͷࢦఠ 8FCQͱ͔$44ͷϓϩύςΟ ͱ͔

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1BHF4QFFE*OTJHIUT͕ग़ͯ͘͠ Δ਺ଟͷରԠ߲໨ άάͬͨΒग़ͯ͘ ΔରԠํ๏ ίϯαϧͷࢦఠ 8FCQͱ͔$44ͷϓϩύςΟ ͱ͔ ܾΊखʹͳ Γ ·ͤΜ

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ޠฐ͕͋ΔͷͰલఏͷ͓࿩ w Φ ϛΧ ϨϝϯόʔʹΑ Δϑϩϯ τ࣮૷͸ɺ ͦΜͳʹແ஡͸͍ͯ͠ͳ͍ w ͳͷͰɺ େ͖ ͘ᆝଛͱͳΔΑ ͏ ͳࣄ͸͢ͰʹରԠ͍ͯ͠Δঢ়ଶ w ޽ʹ͋;Ε͍ͯΔͷ͸ϑϩϯ τΤϯ υ·ΘΓͷ͜ ͱ͹͔Γ w νϦ πϞ͸൱ఆ͠ͳ͍͕ɺ νϦ͸νϦ

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Φ ϛ Χ ϨͰ-$1ͷͨΊʹߦͬͨओͳ͜ ͱ w -$1ର৅ίϯςϯπͷݻఆ w 55'#࡟ݮ

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-$1ର৅ίϯςϯπͷݻఆ -$1ର৅ίϯςϯπ ͱ ͯ͜͠ΕΛ௥Ճ

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-$1ର৅ίϯςϯπͷݻఆ -$1ର৅ίϯςϯπ ͱ ͯ͜͠ΕΛ௥Ճ Ͱͳ͍ͱɺ ͜ ͪ Β͕-$1ͱೝࣝ͞Εɺ ͍͢͝਺஋ʹ

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-$1ର৅ίϯςϯπͷݻఆ %FW5PPMTͰ֬ೝͰ͖ ·͢

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-$1ର৅ίϯςϯπͷݻఆ ͜ ͜ͷ໘ੵ͕૬ରతʹখ͍͞ͱ ͜ ͬ ͕ͪ-$1ʹͳͬͨΓ ࢖͑Δը૾ͷαΠ ζΛϧʔϧԽ

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55'#࡟ݮ 5JNF5P'JSTU#JUFཁ͸αʔόʔͷॲཧ࣌ؒ

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͋͑ͯݴ͏ ͱɺ 55'#Ͱඵ͔͔͍ͬͯΕ͹ɺ ԿΛͯ͠΋ແବ

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55'#࡟ݮ w Φ ϛΧ ϨͷΞʔΩςΫνϟ ͱ ͯ͠ɺ   1)1ͷΞϓϦέʔγϣϯαʔό͔Β"1*ʹ)551Ͱ઀ଓ͍ͯ͠Δ w "1*͕ଈϨεϙϯεΛฦͯ͠΋NT͙ Β͍͸ফඅͯ͠͠ · ͏ w όονͰग़ྗ͍ͯ͠Δ੩త+40/ϑ ΝΠϧͷಡΈࠐΈ΋)551 w ͜Ε͕ͨ·ʹNT͙ Β͍ʹͳΔ ͜ ͱ͕͋Δ

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55'#࡟ݮ w $MPVE'SPOUͷίϯςϯπΩϟ ογϡΛར༻͍ͯ͠Δ͕ɺ ώ ο τ཰͸໿ w ώ ο τ͢Δ ͱNTҎԼͰฦ͕͢ɺ ώ ο τ ͍ͯ͠ͳ͍࣌΋ܭଌ͞ΕΔ w ΤοδαʔόʔͷΩϟ ογϡ΢Υʔ ϛ ϯά΋ݕ౼͕ͨ͠ɺ   ͋· Γݱ࣮తͰ͸ͳ͍͠ɺ   "84ͷ υΩϡϝϯ τݟΔݶΓਪ঑΋ ͞Ε͍ͯͳ͍ͷͰ٫Լ

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55'#࡟ݮ w 55'#ͷ໨ඪΛඵ୆ʹઃఆ ʢඵ୆ΛແཧʹૂΘͳ͍ʣ w ؔ਺͝ͱͷ࣌ؒଌఆˠϦ ϑ ΝΫλ Ϧ ϯά w .FNDBDIFEͷపఈ׆༻ w Ωϟ ογϡ΢Υʔ ϛ ϯάͷಋೖ

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55'#࡟ݮ w Ϟχλ Ϧ ϯά͸1BHF4QFFE*OTJHIUTͷ"1*Ͱ55'#Λऔಘͯ͠ه࿥ w $BUDIQPJOUͱ͔࢖͍͍͚ͨͲɺ ίϩφγϣ οΫ଀͍ w ͱ Γ͋͑ͣ࡟ݮʹ͸੒ޭ

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ΦʔϧάϦ ʔϯୡ੒ ʂ

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· ͱΊ w ରԠͯ͠΋ॱҐ্͕͕Δ ͱ͔ظ଴͠ͳ͍ w Ͱ΋ɺ Ϧ ϑ ΝΫλ Ϧ ϯάʹϦ ιʔεΛ౤ೖ͢Δ   ͓୊໨ͱ ͯ͠ͱͯ΋େ͖͍ w ϑϩϯ τΤϯ υͰղܾ͠Α ͏ ͱ ͕͚ͪͩ͠Ͳɺ   ଟ෼ղܾ͠ͳ͍ ͜ ͱ͕ଟ͍ w ·ͣ͸55'#ΛΈΖ ʂ

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͋ Γ ͕ͱ ͏ ͍͟͝· ͨ͠ !NBFQPO