無料オンラインウェブサイト速度テスト
PageSpeed Insightsでウェブサイトの速度とパフォーマンスを分析します。
Frequently Asked Questions
What is a good website load time?
Under 2.5 seconds for LCP (Largest Contentful Paint) is Google's "Good" threshold. Under 1 second is excellent. Pages that take over 4 seconds lose significant users — 53% of mobile users abandon pages taking over 3 seconds.
What is TTFB (Time to First Byte)?
TTFB measures how long from request to receiving the first byte of the server response. Under 200ms is good; under 800ms is acceptable. High TTFB indicates slow server processing, database queries, or geographic distance from the user.
What are Core Web Vitals?
Google's Core Web Vitals are three user experience metrics: LCP (Largest Contentful Paint — loading), INP (Interaction to Next Paint — interactivity), and CLS (Cumulative Layout Shift — visual stability). Good scores positively affect Google search rankings.
Why do speed test results differ from Google PageSpeed Insights?
PSI runs in a simulated Lighthouse environment with throttled connection. This tool measures real server response from our infrastructure. Results vary by test location, time of day, and server load. Use PSI for standardised benchmarking.
How can I improve my website's speed?
Top improvements: use a CDN, enable server-side compression (gzip/brotli), optimize and lazy-load images, minify CSS/JS, reduce server response time (upgrade hosting), eliminate render-blocking resources, and leverage browser caching.
Is the ウェブサイト速度テスト free to use?
Yes, the ウェブサイト速度テスト on Allio Tools is completely free with no sign-up or registration required. It works directly in your browser.
How does the ウェブサイト速度テスト work?
PageSpeed Insightsでウェブサイトの速度とパフォーマンスを分析します。 Your input is processed on Cloudflare's edge infrastructure — it is not stored, logged, or shared with any third party.
Do I need to install anything to use the ウェブサイト速度テスト?
No installation needed. The ウェブサイト速度テスト runs entirely in your web browser on any device — desktop, tablet, or mobile.
Is my data safe when using the ウェブサイト速度テスト?
Yes. Your input is processed on Cloudflare's globally distributed edge network. Data is used only to generate your result and is never stored, logged, or shared with any third party.
Does the ウェブサイト速度テスト work offline?
No — the ウェブサイト速度テスト processes your input on Cloudflare's edge servers and requires an internet connection.
How current is the data returned by the ウェブサイト速度テスト?
The ウェブサイト速度テスト fetches live data in real time each time you run it. Results reflect the current state of the server or domain at the moment of the request.
Why does the ウェブサイト速度テスト sometimes return different results than other tools?
Results depend on the real-time state of the target server and DNS propagation, which can vary by geographic region and caching TTL. If you see inconsistencies, wait a few minutes and re-test — DNS changes can take up to 48 hours to propagate fully worldwide.
Does the ウェブサイト速度テスト work on all browsers?
Yes. The ウェブサイト速度テスト is built with standard browser APIs and works on all modern browsers including Chrome, Firefox, Safari, and Edge — on both desktop and mobile. No plugins, extensions, or third-party software are required.
How do I save or export my results from the ウェブサイト速度テスト?
Select and copy the result text to paste into any document or app. For image tools, a Download button saves the file directly to your device. Your browser's built-in screenshot function also captures results quickly. No account or login is required.