Report Summary

  • 54

    Performance

    Renders faster than
    72% of other websites

  • 78

    Accessibility

    Visual factors better than
    that of 46% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 82

    SEO

    Google-friendlier than
    44% of websites

windows.epfl.ch

windows.epfl.ch: Homepage

Page Load Speed

1.7 sec in total

First Response

472 ms

Resources Loaded

1 sec

Page Rendered

149 ms

windows.epfl.ch screenshot

About Website

Visit windows.epfl.ch now to see the best up-to-date Windows Epfl content for Switzerland and also check out these interesting facts you probably never knew about windows.epfl.ch

Visit windows.epfl.ch

Key Findings

We analyzed Windows.epfl.ch page load time and found that the first response time was 472 ms and then it took 1.2 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 20% of websites can load faster.

Performance Metrics

windows.epfl.ch performance score

54

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.6 s

14/100

10%

LCP (Largest Contentful Paint)

Value5.5 s

19/100

25%

SI (Speed Index)

Value5.8 s

49/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.346

32/100

15%

TTI (Time to Interactive)

Value4.7 s

80/100

10%

Network Requests Diagram

windows.epfl.ch

472 ms

index.asp

338 ms

style.css

193 ms

BandeauEPFL.png

98 ms

LogoWin2k.gif

103 ms

Our browser made a total of 9 requests to load all elements on the main page. We found that all of those requests were addressed to Windows.epfl.ch and no external sources were called. The less responsive or slowest element that took the longest time to load (472 ms) belongs to the original domain Windows.epfl.ch.

Page Optimization Overview & Recommendations

Page size can be reduced by 29.1 kB (72%)

Content Size

40.3 kB

After Optimization

11.2 kB

In fact, the total size of Windows.epfl.ch main page is 40.3 kB. This result falls within a vast category (top 1 000 000) of heavyweight, probably not optimized, and thus slow loading web pages. Only a small number of websites need less resources to load. HTML takes 29.6 kB which makes up the majority of the site volume.

HTML Optimization

-88%

Potential reduce by 26.0 kB

  • Original 29.6 kB
  • After minification 25.5 kB
  • After compression 3.5 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. This page needs HTML code to be minified as it can gain 4.1 kB, which is 14% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 26.0 kB or 88% of the original size.

Image Optimization

-24%

Potential reduce by 2.4 kB

  • Original 9.8 kB
  • After minification 7.4 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, Windows Epfl needs image optimization as it can save up to 2.4 kB or 24% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

CSS Optimization

-73%

Potential reduce by 689 B

  • Original 944 B
  • After minification 697 B
  • After compression 255 B

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. Windows.epfl.ch needs all CSS files to be minified and compressed as it can save up to 689 B or 73% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

7

After Optimization

7

The browser has sent 7 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Windows Epfl. According to our analytics all requests are already optimized.

Accessibility Review

windows.epfl.ch accessibility score

78

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best Practices

windows.epfl.ch 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

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

windows.epfl.ch SEO score

82

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

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    FR

  • Language Claimed

    FR

  • Encoding

    WINDOWS-1252

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Windows.epfl.ch can be misinterpreted by Google and other search engines. Our service has detected that French is used on the page, and it matches the claimed language. Our system also found out that Windows.epfl.ch main page’s claimed encoding is windows-1252. 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

Open Graph description is not detected on the main page of Windows Epfl. 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: