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91
yahoo.co.jp
Last Updated: 7 months
Success
70% of passed verification steps
Warning
15% of total warning
Errors
15% of total errors, require fast action
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Desktop
Mobile
Performance
Desktop Score 78%
Best Practices
Desktop Score 96%
SEO
Desktop Score 85%
Performance
Mobile Score 36%
Best Practices
Mobile Score 74%
SEO
Mobile Score 93%
PWA
Mobile Score 38%
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Social Data
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Desktop
Avoid non-composited animations
15 animated elements found
Animations which are not composited can be janky and increase CLS
Serve static assets with an efficient cache policy
54 resources found
A long cache lifetime can speed up repeat visits to your page
Avoid an excessive DOM size
1,595 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)
Speed Index
2.1 s
Speed Index shows how quickly the contents of a page are visibly populated
Time to Interactive
2.7 s
Time to Interactive is the amount of time it takes for the page to become fully interactive
Properly size images
Potential savings of 164 KiB
Serve images that are appropriately-sized to save cellular data and improve load time
Avoid serving legacy JavaScript to modern browsers
Potential savings of 30 KiB
Polyfills and transforms enable legacy browsers to use new JavaScript features. However, many aren't necessary for modern browsers. For your bundled JavaScript, adopt a modern script deployment strategy using module/nomodule feature detection to reduce the amount of code shipped to modern browsers, while retaining support for legacy browsers
Largest Contentful Paint element
1,240 ms
This is the largest contentful element painted within the viewport
Reduce the impact of third-party code
Third-party code blocked the main thread for 290 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading
Network Round Trip Times
40 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
Avoid chaining critical requests
4 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
Max Potential First Input Delay
230 ms
The maximum potential First Input Delay that your users could experience is the duration of the longest task
Avoid long main-thread tasks
7 long tasks found
Lists the longest tasks on the main thread, useful for identifying worst contributors to input delay
Largest Contentful Paint
1.2 s
Largest Contentful Paint marks the time at which the largest text or image is painted
Total Blocking Time
340 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds
Reduce unused JavaScript
Potential savings of 290 KiB
Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity
Serve images in next-gen formats
Potential savings of 25 KiB
Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption
Server Backend Latencies
150 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Eliminate render-blocking resources
Potential savings of 270 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Initial server response time was short
Root document took 200 ms
Keep the server response time for the main document short because all other requests depend on it
Reduce unused CSS
Potential savings of 52 KiB
Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity
Avoids enormous network payloads
Total size was 1,301 KiB
Large network payloads cost users real money and are highly correlated with long load times
Minimize main-thread work
3.5 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
Reduce JavaScript execution time
1.5 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint
0.9 s
First Contentful Paint marks the time at which the first text or image is painted
Mobile
Speed Index
7.3 s
Speed Index shows how quickly the contents of a page are visibly populated
Serve images in next-gen formats
Potential savings of 8 KiB
Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption
Largest Contentful Paint element
6,130 ms
This is the largest contentful element painted within the viewport
Document uses legible font sizes
79.28% legible text
Font sizes less than 12px are too small to be legible and require mobile visitors to “pinch to zoom” in order to read. Strive to have >60% of page text ≥12px
Web app manifest or service worker do not meet the installability requirements
1 reason
Service worker is the technology that enables your app to use many Progressive Web App features, such as offline, add to homescreen, and push notifications. With proper service worker and manifest implementations, browsers can proactively prompt users to add your app to their homescreen, which can lead to higher engagement
Avoids enormous network payloads
Total size was 822 KiB
Large network payloads cost users real money and are highly correlated with long load times
Initial server response time was short
Root document took 320 ms
Keep the server response time for the main document short because all other requests depend on it
Time to Interactive
10.8 s
Time to Interactive is the amount of time it takes for the page to become fully interactive
Max Potential First Input Delay
350 ms
The maximum potential First Input Delay that your users could experience is the duration of the longest task
Avoid long main-thread tasks
20 long tasks found
Lists the longest tasks on the main thread, useful for identifying worst contributors to input delay
Reduce unused CSS
Potential savings of 12 KiB
Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity
First Contentful Paint
3.7 s
First Contentful Paint marks the time at which the first text or image is painted
Uses deprecated APIs
1 warning found
Deprecated APIs will eventually be removed from the browser
Enable text compression
Potential savings of 19 KiB
Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes
robots.txt is not valid
98 errors found
If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed
Serve static assets with an efficient cache policy
28 resources found
A long cache lifetime can speed up repeat visits to your page
Avoid large layout shifts
3 elements found
These DOM elements were most affected by layout shifts. Some layout shifts may not be included in the CLS metric value due to [windowing](https://web.dev/articles/cls#what_is_cls)
Largest Contentful Paint
6.1 s
Largest Contentful Paint marks the time at which the largest text or image is painted
Avoid an excessive DOM size
1,304 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)
Network Round Trip Times
230 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
Total Blocking Time
1,710 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds
Reduce the impact of third-party code
Third-party code blocked the main thread for 1,450 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading
Reduce unused JavaScript
Potential savings of 155 KiB
Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity
Cumulative Layout Shift
0.077
Cumulative Layout Shift measures the movement of visible elements within the viewport
Reduce JavaScript execution time
4.9 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Server Backend Latencies
500 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Avoid serving legacy JavaScript to modern browsers
Potential savings of 1 KiB
Polyfills and transforms enable legacy browsers to use new JavaScript features. However, many aren't necessary for modern browsers. For your bundled JavaScript, adopt a modern script deployment strategy using module/nomodule feature detection to reduce the amount of code shipped to modern browsers, while retaining support for legacy browsers
Tap targets are sized appropriately
100% appropriately sized tap targets
Interactive elements like buttons and links should be large enough (48x48px), or have enough space around them, to be easy enough to tap without overlapping onto other elements
Avoid multiple page redirects
Potential savings of 780 ms
Redirects introduce additional delays before the page can be loaded
First Meaningful Paint
5.0 s
First Meaningful Paint measures when the primary content of a page is visible
User Timing marks and measures
4 user timings
Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences
Minimize main-thread work
8.3 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
Avoid chaining critical requests
4 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
Speed And Optimization Tips
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Alexa Rank
99,999,999
Global Rank
99,999,999
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Status
yahoo.co.co
Available
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yahoo.co.us
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yahoo.co.com
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yhoo.co.jp
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bahoo.co.jp
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hahoo.co.jp
Available
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