Tools & Wizards About Us
stduviewer.ru screenshot

Report Summary

  • 56

    Performance

    Renders faster than
    73% of other websites

  • 86

    Accessibility

    Visual factors better than
    that of 62% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 69

    SEO

    Google-friendlier than
    28% of websites

stduviewer.ru

STDU Viewer - Официальный сайт

Page Load Speed

2.4 sec in total

First Response

537 ms

Resources Loaded

1.7 sec

Page Rendered

136 ms

stduviewer.ru screenshot

About Website

Welcome to stduviewer.ru homepage info - get ready to check STDU Viewer best content for Russia right away, or after learning these important things about stduviewer.ru

STDU Viewer - лучший просмотрщик PDF, DjVu, XPS и других электронных документов различных форматов. Один просмотрщик для всех форматов.

Visit stduviewer.ru

Key Findings

We analyzed Stduviewer.ru page load time and found that the first response time was 537 ms and then it took 1.8 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 35% of websites can load faster.

Performance Metrics

stduviewer.ru performance score

56

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.1 s

82/100

10%

LCP (Largest Contentful Paint)

Value2.1 s

96/100

25%

SI (Speed Index)

Value5.2 s

61/100

10%

TBT (Total Blocking Time)

Value3,730 ms

1/100

30%

CLS (Cumulative Layout Shift)

Value0.006

100/100

15%

TTI (Time to Interactive)

Value10.3 s

25/100

10%

Network Requests Diagram

stduviewer.ru

537 ms

general.css

142 ms

product_part.css

267 ms

PreviewImage.js

276 ms

twitter.png

463 ms

Our browser made a total of 30 requests to load all elements on the main page. We found that all of those requests were addressed to Stduviewer.ru and no external sources were called. The less responsive or slowest element that took the longest time to load (722 ms) belongs to the original domain Stduviewer.ru.

Page Optimization Overview & Recommendations

Page size can be reduced by 32.3 kB (59%)

Content Size

54.8 kB

After Optimization

22.5 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Stduviewer.ru main page is 54.8 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. Only 10% of websites need less resources to load. Images take 18.4 kB which makes up the majority of the site volume.

HTML Optimization

-71%

Potential reduce by 9.7 kB

  • Original 13.6 kB
  • After minification 12.4 kB
  • After compression 4.0 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 9.7 kB or 71% of the original size.

Image Optimization

-21%

Potential reduce by 3.9 kB

  • Original 18.4 kB
  • After minification 14.5 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. Obviously, STDU Viewer needs image optimization as it can save up to 3.9 kB or 21% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-82%

Potential reduce by 13.0 kB

  • Original 15.9 kB
  • After minification 12.2 kB
  • After compression 2.9 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 13.0 kB or 82% of the original size.

CSS Optimization

-84%

Potential reduce by 5.7 kB

  • Original 6.8 kB
  • After minification 5.6 kB
  • After compression 1.1 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Stduviewer.ru needs all CSS files to be minified and compressed as it can save up to 5.7 kB or 84% of the original size.

Requests Breakdown

Number of requests can be reduced by 11 (38%)

Requests Now

29

After Optimization

18

  • Images
  • JavaScript
  • CSS

The browser has sent 29 CSS, Javascripts, AJAX and image requests in order to completely render the main page of STDU Viewer. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests and as a result speed up the page load time.

Network Requests Diagram

stduviewer.ru

stduviewer.ru

537 ms

general.css

general.css

142 ms

product_part.css

product_part.css

267 ms

PreviewImage.js

PreviewImage.js

276 ms

twitter.png

twitter.png

463 ms

googleplus.png

googleplus.png

594 ms

facebook.png

facebook.png

722 ms

top_bg.gif

top_bg.gif

144 ms

top_title.png

top_title.png

143 ms

products_button_a.gif

products_button_a.gif

135 ms

downloads_button_c.gif

downloads_button_c.gif

267 ms

buy_now_button_c.gif

buy_now_button_c.gif

275 ms

articles_button_c.gif

articles_button_c.gif

270 ms

contact_us_button_c.gif

contact_us_button_c.gif

280 ms

top_main_bg.gif

top_main_bg.gif

281 ms

screenshot_title.gif

screenshot_title.gif

278 ms

screenshot_bg.gif

screenshot_bg.gif

398 ms

viewerscr1.gif

viewerscr1.gif

401 ms

viewerscr2.gif

viewerscr2.gif

413 ms

viewerscr3.gif

viewerscr3.gif

554 ms

viewerscr4.gif

viewerscr4.gif

418 ms

viewerscr5.gif

viewerscr5.gif

420 ms

viewerscr6.gif

viewerscr6.gif

531 ms

viewerscr7.gif

viewerscr7.gif

535 ms

product_part_title.gif

product_part_title.gif

550 ms

product_part.gif

product_part.gif

556 ms

product_part_sys_req.gif

product_part_sys_req.gif

559 ms

bottom_bg.gif

bottom_bg.gif

666 ms

wait_anim_1.png

wait_anim_1.png

137 ms

preview_spacer.gif

preview_spacer.gif

139 ms

Accessibility Review

stduviewer.ru accessibility score

86

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

Best Practices

stduviewer.ru best practices score

75

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

stduviewer.ru SEO score

69

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

robots.txt is not valid

Language and Encoding

  • Language Detected

    RU

  • Language Claimed

    RU

  • Encoding

    WIN-1251

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Stduviewer.ru can be misinterpreted by Google and other search engines. Our service has detected that Russian is used on the page, and it matches the claimed language. Our system also found out that Stduviewer.ru main page’s claimed encoding is win-1251. 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

stduviewer.ru

Open Graph description is not detected on the main page of STDU Viewer. 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: