Tools & Wizards About Us
libros.csic.es screenshot

Report Summary

  • 77

    Performance

    Renders faster than
    84% of other websites

  • 93

    Accessibility

    Visual factors better than
    that of 81% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 75

    SEO

    Google-friendlier than
    32% of websites

libros.csic.es

Libros CSIC: libros electrónicos del Consejo Superior de Investigaciones Científicas (CSIC)

Page Load Speed

23.7 sec in total

First Response

817 ms

Resources Loaded

21.8 sec

Page Rendered

1.1 sec

libros.csic.es screenshot

About Website

Click here to check amazing Libros CSIC content for Spain. Otherwise, check out these important facts you probably never knew about libros.csic.es

Spanish National Research Council (CSIC) website digital eBooks on: Art, Archaeology, Philosophy, History, Language and Literature, Classical Greek and Latin, Social Sciences, Science and Technology, ...

Visit libros.csic.es

Key Findings

We analyzed Libros.csic.es page load time and found that the first response time was 817 ms and then it took 22.9 sec to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster. Unfortunately, there was 1 request timeout, which can generally increase the web page load time, as the browser stays idle while waiting for website response.

Performance Metrics

libros.csic.es performance score

77

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.4 s

97/100

10%

LCP (Largest Contentful Paint)

Value2.1 s

96/100

25%

SI (Speed Index)

Value2.8 s

96/100

10%

TBT (Total Blocking Time)

Value900 ms

31/100

30%

CLS (Cumulative Layout Shift)

Value0.003

100/100

15%

TTI (Time to Interactive)

Value2.7 s

97/100

10%

Network Requests Diagram

libros.csic.es

817 ms

libros.css

155 ms

banner.gif

234 ms

button_search.gif

240 ms

icon.gif

176 ms

Our browser made a total of 64 requests to load all elements on the main page. We found that 97% of them (62 requests) were addressed to the original Libros.csic.es, 2% (1 request) were made to Statcounter.com and 2% (1 request) were made to C.statcounter.com. The less responsive or slowest element that took the longest time to load (20.1 sec) belongs to the original domain Libros.csic.es.

Page Optimization Overview & Recommendations

Page size can be reduced by 715.3 kB (7%)

Content Size

10.6 MB

After Optimization

9.8 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Libros.csic.es main page is 10.6 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 55% of websites need less resources to load. Images take 10.5 MB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 32.8 kB

  • Original 41.2 kB
  • After minification 39.7 kB
  • After compression 8.5 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. 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 32.8 kB or 79% of the original size.

Image Optimization

-6%

Potential reduce by 652.6 kB

  • Original 10.5 MB
  • After minification 9.8 MB

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. Libros CSIC images are well optimized though.

JavaScript Optimization

-60%

Potential reduce by 12.9 kB

  • Original 21.5 kB
  • After minification 21.5 kB
  • After compression 8.6 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 12.9 kB or 60% of the original size.

CSS Optimization

-85%

Potential reduce by 17.0 kB

  • Original 19.9 kB
  • After minification 14.2 kB
  • After compression 2.9 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. Libros.csic.es needs all CSS files to be minified and compressed as it can save up to 17.0 kB or 85% of the original size.

Requests Breakdown

Number of requests can be reduced by 12 (19%)

Requests Now

62

After Optimization

50

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 62 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Libros CSIC. 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

libros.csic.es

libros.csic.es

817 ms

libros.css

libros.css

155 ms

banner.gif

banner.gif

234 ms

button_search.gif

button_search.gif

240 ms

icon.gif

icon.gif

176 ms

icon.gif

icon.gif

177 ms

icono_login.png

icono_login.png

239 ms

arrow_right.gif

arrow_right.gif

232 ms

valid-xhtml10.gif

valid-xhtml10.gif

237 ms

valid-css2.gif

valid-css2.gif

237 ms

wcag1AA.gif

wcag1AA.gif

311 ms

book_1819_img.jpg

book_1819_img.jpg

319 ms

book_1818_img.jpg

book_1818_img.jpg

791 ms

book_1817_img.jpg

book_1817_img.jpg

483 ms

book_1816_img.jpg

book_1816_img.jpg

481 ms

book_1812_img.jpg

book_1812_img.jpg

563 ms

book_1810_img.jpg

book_1810_img.jpg

474 ms

book_1723_img.jpg

book_1723_img.jpg

477 ms

book_1718_img.jpg

book_1718_img.jpg

631 ms

book_1725_img.jpg

book_1725_img.jpg

560 ms

book_1719_img.jpg

book_1719_img.jpg

641 ms

book_1720_img.jpg

book_1720_img.jpg

643 ms

book_1726_img.jpg

book_1726_img.jpg

721 ms

counter_xhtml.js

counter_xhtml.js

22 ms

book_1721_img.jpg

book_1721_img.jpg

645 ms

book_1724_img.jpg

book_1724_img.jpg

717 ms

book_1520_img.jpg

book_1520_img.jpg

798 ms

book_1459_img.jpg

book_1459_img.jpg

722 ms

book_1460_img.jpg

book_1460_img.jpg

727 ms

book_1472_img.jpg

book_1472_img.jpg

799 ms

book_1470_img.jpg

book_1470_img.jpg

799 ms

book_1471_img.jpg

book_1471_img.jpg

802 ms

book_1483_img.jpg

book_1483_img.jpg

807 ms

book_1484_img.jpg

book_1484_img.jpg

867 ms

book_1521_img.jpg

book_1521_img.jpg

880 ms

book_1523_img.jpg

book_1523_img.jpg

883 ms

book_1493_img.jpg

book_1493_img.jpg

885 ms

book_1524_img.jpg

book_1524_img.jpg

889 ms

t.php

t.php

95 ms

piwik.js

piwik.js

796 ms

book_1491_img.jpg

book_1491_img.jpg

849 ms

book_1525_img.jpg

book_1525_img.jpg

865 ms

book_988_img.jpg

book_988_img.jpg

810 ms

book_108_img.jpg

book_108_img.jpg

812 ms

book_716_img.jpg

book_716_img.jpg

812 ms

book_1455_img.jpg

book_1455_img.jpg

818 ms

book_756_img.jpg

book_756_img.jpg

868 ms

book_1515_img.jpg

book_1515_img.jpg

884 ms

fondo.png

fondo.png

812 ms

lb.jpg

lb.jpg

732 ms

rb.jpg

rb.jpg

581 ms

bb.jpg

bb.jpg

586 ms

blc.jpg

blc.jpg

631 ms

brc.jpg

brc.jpg

645 ms

tb.jpg

tb.jpg

567 ms

tlc.jpg

tlc.jpg

566 ms

trc.jpg

trc.jpg

503 ms

arrow.gif

arrow.gif

500 ms

format-justify-fill2.png

format-justify-fill2.png

548 ms

07-gob-mci-csic-sin-texto-editorial-csic-web1-original.jpg

07-gob-mci-csic-sin-texto-editorial-csic-web1-original.jpg

559 ms

logoiso9001color.png

logoiso9001color.png

488 ms

cpAGE_30.gif

cpAGE_30.gif

487 ms

librosqr.jpg

librosqr.jpg

487 ms

piwik.php

piwik.php

20115 ms

Accessibility Review

libros.csic.es accessibility score

93

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

Links do not have a discernible name

Best Practices

libros.csic.es 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

Displays images with incorrect aspect ratio

High

Serves images with low resolution

SEO Factors

libros.csic.es SEO score

75

Search Engine Optimization Advices

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    EN

  • Encoding

    ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Libros.csic.es can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Libros.csic.es main page’s claimed encoding is iso-8859-1. 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

libros.csic.es

Open Graph description is not detected on the main page of Libros CSIC. 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: