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dual-n-back.com screenshot

Report Summary

  • 62

    Performance

    Renders faster than
    77% of other websites

  • 66

    Accessibility

    Visual factors better than
    that of 31% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 58

    SEO

    Google-friendlier than
    20% of websites

dual-n-back.com

Dual n-task - dual-n-task.com

Page Load Speed

777 ms in total

First Response

173 ms

Resources Loaded

501 ms

Page Rendered

103 ms

dual-n-back.com screenshot

About Website

Click here to check amazing Dual Nback content for Russia. Otherwise, check out these important facts you probably never knew about dual-n-back.com

Visit dual-n-back.com

Key Findings

We analyzed Dual-n-back.com page load time and found that the first response time was 173 ms and then it took 604 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 10% of websites can load faster.

Performance Metrics

dual-n-back.com performance score

62

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value0.8 s

100/100

10%

LCP (Largest Contentful Paint)

Value0.8 s

100/100

25%

SI (Speed Index)

Value4.5 s

71/100

10%

TBT (Total Blocking Time)

Value2,180 ms

6/100

30%

CLS (Cumulative Layout Shift)

Value0.019

100/100

15%

TTI (Time to Interactive)

Value9.8 s

28/100

10%

Network Requests Diagram

dual-n-back.com

173 ms

banner-ad.gif

18 ms

show_ads.js

7 ms

b1.gif

48 ms

b8.gif

104 ms

Our browser made a total of 17 requests to load all elements on the main page. We found that 29% of them (5 requests) were addressed to the original Dual-n-back.com, 24% (4 requests) were made to Tpc.googlesyndication.com and 18% (3 requests) were made to Pagead2.googlesyndication.com. The less responsive or slowest element that took the longest time to load (173 ms) belongs to the original domain Dual-n-back.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 3.1 kB (13%)

Content Size

22.7 kB

After Optimization

19.6 kB

  • HTML
  • Images
  • JavaScript

In fact, the total size of Dual-n-back.com main page is 22.7 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 20% of websites need less resources to load. Javascripts take 14.5 kB which makes up the majority of the site volume.

HTML Optimization

-55%

Potential reduce by 2.9 kB

  • Original 5.4 kB
  • After minification 5.3 kB
  • After compression 2.4 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 2.9 kB or 55% of the original size.

Image Optimization

-1%

Potential reduce by 18 B

  • Original 2.8 kB
  • After minification 2.8 kB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Dual Nback images are well optimized though.

JavaScript Optimization

-1%

Potential reduce by 109 B

  • Original 14.5 kB
  • After minification 14.4 kB
  • After compression 14.4 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. This website has mostly compressed JavaScripts.

Requests Breakdown

Number of requests can be reduced by 4 (25%)

Requests Now

16

After Optimization

12

  • AJAX
  • Images
  • JavaScript

The browser has sent 16 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Dual Nback. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

dual-n-back.com

dual-n-back.com

173 ms

banner-ad.gif

banner-ad.gif

18 ms

show_ads.js

show_ads.js

7 ms

b1.gif

b1.gif

48 ms

b8.gif

b8.gif

104 ms

b3.gif

b3.gif

105 ms

b4.gif

b4.gif

104 ms

zrt_lookup.html

zrt_lookup.html

38 ms

show_ads_impl.js

show_ads_impl.js

46 ms

ads

ads

161 ms

osd.js

osd.js

28 ms

m_js_controller.js

m_js_controller.js

28 ms

abg.js

abg.js

39 ms

googlelogo_color_112x36dp.png

googlelogo_color_112x36dp.png

24 ms

nessie_icon_tiamat_white.png

nessie_icon_tiamat_white.png

19 ms

s

s

10 ms

x_button_blue2.png

x_button_blue2.png

5 ms

Accessibility Review

dual-n-back.com accessibility score

66

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

[aria-*] attributes do not match their roles

Names and labels

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

Best Practices

dual-n-back.com best practices score

67

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

High

Browser errors were logged to the console

SEO Factors

dual-n-back.com SEO score

58

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Image elements do not have [alt] attributes

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    N/A

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Dual-n-back.com can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Dual-n-back.com main page’s claimed encoding is . Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

dual-n-back.com

Open Graph description is not detected on the main page of Dual Nback. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: