Webサイトの速度
How fast your website feels on a phone, and how to make it faster. We explain Google PageSpeed scores and Core Web Vitals — LCP, CLS and INP — in simple words. Articles show which images, scripts, fonts and server settings slow pages down the most. Each guide ranks fixes by impact, so you start with the change that saves the most seconds. We also cover hosting, caching and compression without needing a developer for every step. Faster pages keep more visitors and rank better in search.
2026/10/05 · 8分で読めますCDN Cache Hit Ratio: Why Your CDN Is Not Making You Faster
A CDN only speeds up your site when it serves pages from cache. Learn what cache hit ratio means, how to check it and…
2026/10/02 · 9分で読めますIs AMP Still Worth It? Accelerated Mobile Pages Today
AMP no longer earns a search badge or Top Stories access. Learn when keeping Accelerated Mobile Pages still makes sense and how to remove…
2026/10/01 · 8分で読めますImage CDNs Explained: Automatic Resizing and Modern Formats
An image CDN resizes, compresses and converts images on the fly for each device. Learn how it works, what it costs, and when it…
2026/10/01 · 8分で読めますWhy Your Website Slows Down or Crashes During Traffic Spikes
Sales, newsletters and viral posts can bring a website to its knees. Learn why sites slow down under load and how to prepare so…
2026/10/01 · 8分で読めますFetchpriority Explained: Tell the Browser What Matters First
The fetchpriority attribute lets you tell browsers which image or script matters most. Learn when to use high and low, with examples and mistakes…
2026/10/01 · 8分で読めますUnused CSS: How to Find and Remove It Without Breaking Pages
PageSpeed says "Reduce unused CSS"? Learn where unused CSS comes from, how to measure it with Coverage, and how to remove it safely without…
2026/10/01 · 9分で読めますWhy Your PageSpeed Score Changes Every Time You Test
Your PageSpeed score jumps between tests even when nothing changed. Here is why lab scores vary, what is normal, and how to measure speed…
2026/09/30 · 8分で読めますSpeculation Rules: Prerender Pages for Near-Instant Clicks
The Speculation Rules API lets browsers prefetch or prerender the next page before a click. Learn how it works, when to use it and…
Icon Fonts vs SVG Icons: Which Is Better for Page Speed?
Icon fonts load a whole font for a few icons and can flash or shift on load. See why SVG icons are usually faster…
2026/09/30 · 7分で読めますPerformance Budgets: How to Keep a Fast Website Fast
A performance budget sets limits for page weight, scripts and load times so a fast website stays fast. Learn how to set one, track…
2026/09/30 · 8分で読めますEmbedding Google Maps Without Slowing Down Your Pages
A Google Maps embed can add heavy scripts to every page it appears on. Learn how to lazy-load maps, use a static preview and…
2026/09/30 · 9分で読めますDoes Server Location Affect Website Speed? What to Know
Server location adds network delay to every request. Learn when distance really slows a website, how to measure it and when a CDN or…