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パフォーマンス

DOMサイズ、インラインCSS/JS、レンダリングブロックリソース、遅延読み込み、最新画像形式。

チェック内容

We analyze inline CSS/JS, render-blocking resources, DOM size, image optimization (lazy loading, modern formats), viewport meta tag, and resource counts.

個別チェック項目

Inline CSS

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Detects excessive inline style blocks that increase page size.

Example: <style>...</style>
Best practice: ≤3 blocks, ≤10KB

Inline JS

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Detects excessive inline script blocks that block rendering.

Example: <script>...</script>
Best practice: ≤5 blocks, ≤20KB

Render-blocking

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Identifies CSS/JS in head that block page rendering.

Example: <script src="..." async>
Best practice: async or defer

Image Dimensions

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Checks if images have width/height to prevent layout shift.

Example: <img width="800" height="600">
Best practice: 100%

Lazy Loading

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Checks for loading="lazy" on below-fold images.

Example: <img loading="lazy">
Best practice: All below-fold images

Viewport Meta

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Verifies viewport meta tag for mobile rendering.

Example: <meta name="viewport" content="width=device-width">
Best practice: 存在

DOM Size

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Counts DOM elements. Large DOM slows rendering.

Best practice: <1500 elements

CSS Files

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Counts external CSS files. Too many increase load time.

Example: <link rel="stylesheet" href="...">
Best practice: ≤8

JS Files

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Counts external JS files. Too many increase load time.

Example: <script src="...">
Best practice: ≤10

Modern Image Formats

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Checks for modern image formats (WebP/AVIF).

Example: <img src="photo.webp">
Best practice: WebP/AVIF

なぜ重要か

Page speed directly affects rankings and user experience. Render-blocking resources, excessive inline code, and unoptimized images increase load times and hurt Core Web Vitals.

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