Report Summary

  • 15

    Performance

    Renders faster than
    27% of other websites

  • 95

    Accessibility

    Visual factors better than
    that of 87% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    81% of websites

  • 85

    SEO

    Google-friendlier than
    56% of websites

library.epfl.ch

Bibliothèque ‐ EPFL

Page Load Speed

4.1 sec in total

First Response

917 ms

Resources Loaded

2.9 sec

Page Rendered

258 ms

library.epfl.ch screenshot

About Website

Click here to check amazing Library EPFL content for Switzerland. Otherwise, check out these important facts you probably never knew about library.epfl.ch

Visit library.epfl.ch

Key Findings

We analyzed Library.epfl.ch page load time and found that the first response time was 917 ms and then it took 3.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 55% of websites can load faster.

Performance Metrics

library.epfl.ch performance score

15

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.6 s

5/100

10%

LCP (Largest Contentful Paint)

Value6.0 s

13/100

25%

SI (Speed Index)

Value11.7 s

4/100

10%

TBT (Total Blocking Time)

Value5,050 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.158

73/100

15%

TTI (Time to Interactive)

Value23.7 s

1/100

10%

Network Requests Diagram

library.epfl.ch

917 ms

epfl.css

767 ms

homePortal.css

188 ms

jahia.css

279 ms

main.css

295 ms

Our browser made a total of 74 requests to load all elements on the main page. We found that 22% of them (16 requests) were addressed to the original Library.epfl.ch, 22% (16 requests) were made to Epfl.ch and 18% (13 requests) were made to Actu.epfl.ch. The less responsive or slowest element that took the longest time to load (917 ms) belongs to the original domain Library.epfl.ch.

Page Optimization Overview & Recommendations

Page size can be reduced by 378.3 kB (42%)

Content Size

908.8 kB

After Optimization

530.5 kB

In fact, the total size of Library.epfl.ch main page is 908.8 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. 50% of websites need less resources to load. Images take 396.1 kB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 38.4 kB

  • Original 48.1 kB
  • After minification 38.1 kB
  • After compression 9.7 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 9.9 kB, which is 21% 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 38.4 kB or 80% of the original size.

Image Optimization

-11%

Potential reduce by 42.5 kB

  • Original 396.1 kB
  • After minification 353.6 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, Library EPFL needs image optimization as it can save up to 42.5 kB or 11% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-58%

Potential reduce by 184.3 kB

  • Original 320.3 kB
  • After minification 307.4 kB
  • After compression 136.0 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 184.3 kB or 58% of the original size.

CSS Optimization

-78%

Potential reduce by 113.1 kB

  • Original 144.3 kB
  • After minification 118.6 kB
  • After compression 31.2 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. Library.epfl.ch needs all CSS files to be minified and compressed as it can save up to 113.1 kB or 78% of the original size.

Requests Breakdown

Number of requests can be reduced by 35 (48%)

Requests Now

73

After Optimization

38

The browser has sent 73 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Library EPFL. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 12 to 1 for JavaScripts and from 10 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

library.epfl.ch accessibility score

95

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.

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

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Best Practices

library.epfl.ch best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

library.epfl.ch SEO score

85

Search Engine Optimization Advices

Crawling and Indexing

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

Impact

Issue

High

Links are not crawlable

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

    N/A

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Library.epfl.ch can be misinterpreted by Google and other search engines. Unfortunately we cannot identify language used on the page (probably there is a mix of languages, too little text or something else), while the claimed language is English. Our system also found out that Library.epfl.ch main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

Open Graph description is not detected on the main page of Library 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: