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- SEOã®ã¡ãªããïŒããŒãžããŒãé床ã®åäžã¯ãæ€çŽ¢ãšã³ãžã³ã®ã¢ã«ãŽãªãºã ã«ãããéèŠãªã©ã³ãã³ã°èŠçŽ ã§ãã
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1. ããã€ã¹æ€åºãšæ©èœæ€åº
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- ãŠãŒã¶ãŒãšãŒãžã§ã³ãã¹ãããã£ã³ã°ïŒãŠãŒã¶ãŒãšãŒãžã§ã³ãæååãåæããŠãããã€ã¹ã®çš®é¡ããªãã¬ãŒãã£ã³ã°ã·ã¹ãã ããã©ãŠã¶ãç¹å®ããŸããæ³šæïŒãŠãŒã¶ãŒãšãŒãžã§ã³ãæååã¯ä¿¡é Œæ§ãäœããç°¡åã«åœè£ ãããå¯èœæ§ããããŸãããŠãŒã¶ãŒãšãŒãžã§ã³ãã¹ãããã£ã³ã°ãžã®é床ã®äŸåã¯ãäžæ£ç¢ºãªã¿ãŒã²ãã£ã³ã°ã«ã€ãªããå¯èœæ§ããããŸãã
- æ©èœæ€åºïŒModernizrïŒïŒModernizrãªã©ã®JavaScriptã©ã€ãã©ãªã䜿çšããŠãç¹å®ã®ãã©ãŠã¶æ©èœïŒWebPãµããŒããã¿ããã€ãã³ããªã©ïŒã®ååšãæ€åºããŸããããã¯ããŠãŒã¶ãŒãšãŒãžã§ã³ãã¹ãããã£ã³ã°ãããä¿¡é Œæ§ã®é«ãã¢ãããŒãã§ãã
- ã¯ã©ã€ã¢ã³ããã³ãïŒãã©ãŠã¶ãããã€ã¹æ å ±ããµãŒããŒã«æç€ºçã«äŒéã§ããæ°ããHTTPããããŒã¡ã«ããºã ãããã¯ããŠãŒã¶ãŒãšãŒãžã§ã³ãã¹ãããã£ã³ã°ãšæ¯èŒããŠããã©ã€ãã·ãŒãå°éããæšæºåãããã¢ãããŒãã§ãã
äŸïŒModernizrã䜿çšããæ©èœæ€åºïŒïŒ
if (Modernizr.webp) {
// Load WebP images
document.getElementById('myImage').src = 'image.webp';
} else {
// Load fallback JPEG or PNG image
document.getElementById('myImage').src = 'image.jpg';
}
2. ãããã¯ãŒã¯ç°å¢ã®æ€åº
ãŠãŒã¶ãŒã®ãããã¯ãŒã¯æ¥ç¶ãçè§£ããããšã¯ãã¢ã»ããé ä¿¡ãæé©åããããã«éåžžã«éèŠã§ããæ¬¡ã®æ¹æ³ã§ãããã¯ãŒã¯ç°å¢ãæ€åºã§ããŸãã
- Network Information APIïŒãã®APIã¯ããŠãŒã¶ãŒã®æ¥ç¶ã¿ã€ãïŒ2Gã3Gã4GãWi-Fiãªã©ïŒãšæšå®åž¯åå¹ ã«é¢ããæ å ±ãæäŸããŸãããã ãããã©ãŠã¶ã®ãµããŒãã¯å¶éãããå ŽåããããŸãã
- ã©ãŠã³ãããªããæéïŒRTTïŒã®æšå®ïŒå°ããªãªã¯ãšã¹ãããµãŒããŒã«å°éããŠæ»ããŸã§ã«ãããæéãæž¬å®ããŸããããã¯ããããã¯ãŒã¯ã®é å»¶ã瀺ããŸãã
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äŸïŒNetwork Information APIã®äœ¿çšïŒïŒ
if ('connection' in navigator) {
const connection = navigator.connection;
const effectiveType = connection.effectiveType; // "slow-2g", "2g", "3g", or "4g"
if (effectiveType === 'slow-2g' || effectiveType === '2g') {
// Load low-resolution images and disable animations
}
}
3. æ¡ä»¶ä»ãããŒãã£ã³ã°
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- JavaScriptæé©åïŒå¿ èŠãªJavaScriptã³ãŒãã®ã¿ãããŒãããŸããæåã®ããŒãžããŒãã®åŸãŸã§ãéèŠã§ãªãã¹ã¯ãªããã®ããŒããå»¶æããŸããã³ãŒãåå²ã䜿çšããŠã倧ããªJavaScriptãã³ãã«ãããå°ããããã管çãããããã£ã³ã¯ã«åå²ããŸãã
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- ãããªæé©åïŒãããã¯ãŒã¯é床ãšããã€ã¹ã®æ©èœã«åºã¥ããŠãããŸããŸãªãããªå質ãæäŸããŸããã¢ãããã£ããããã¬ãŒãã¹ããªãŒãã³ã°ïŒHLSãDASHãªã©ïŒã䜿çšããŠããããã¯ãŒã¯ç°å¢ã«åºã¥ããŠãããªå質ãåçã«èª¿æŽããŸãã
- æ©èœã®åãæ¿ãïŒããã€ã¹ã®æ©èœãŸãã¯ãŠãŒã¶ãŒã®èšå®ã«åºã¥ããŠãç¹å®ã®æ©èœãæå¹ãŸãã¯ç¡å¹ã«ããŸããããšãã°ãå€ãããã€ã¹ã§ã¯ã¢ãã¡ãŒã·ã§ã³ãŸãã¯è€éãªèŠèŠå¹æãç¡å¹ã«ããå ŽåããããŸãã
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4. é å»¶èªã¿èŸŒã¿
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- Intersection Observer APIïŒãã®APIã䜿çšãããšãèŠçŽ ããã¥ãŒããŒãã«å ¥ã£ãããšãæ€åºããé¢é£ãããªãœãŒã¹ã®èªã¿èŸŒã¿ãããªã¬ãŒã§ããŸãã
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äŸïŒLighthouse CIã䜿çšããããã©ãŒãã³ã¹äºç®ïŒïŒ
module.exports = {
ci: {
collect: {
url: 'http://localhost:3000',
numberOfRuns: 3,
},
assert: {
assertions: {
'first-contentful-paint': ['warn', { maxNumericValue: 2000 }],
'largest-contentful-paint': ['warn', { maxNumericValue: 4000 }],
'total-blocking-time': ['warn', { maxNumericValue: 300 }],
'cumulative-layout-shift': ['warn', { maxNumericValue: 0.1 }],
},
},
upload: {
target: 'temporary-public-storage',
},
},
};
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