Tools & Wizards About Us

Report Summary

  • 37

    Performance

    Renders faster than
    56% of other websites

  • 89

    Accessibility

    Visual factors better than
    that of 71% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 79

    SEO

    Google-friendlier than
    40% of websites

catalogo.zanichelli.it

Catalogo storico: presentazione e consultazione - Zanichelli

Page Load Speed

2.9 sec in total

First Response

496 ms

Resources Loaded

2.3 sec

Page Rendered

106 ms

About Website

Welcome to catalogo.zanichelli.it homepage info - get ready to check Catalogo Zanichelli best content for Italy right away, or after learning these important things about catalogo.zanichelli.it

catalogo storico della casa editrice Zanichelli di Bologna, da più 150 anni al servizio della cultura in Italia

Visit catalogo.zanichelli.it

Key Findings

We analyzed Catalogo.zanichelli.it page load time and found that the first response time was 496 ms and then it took 2.4 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 45% of websites can load faster.

Performance Metrics

catalogo.zanichelli.it performance score

37

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.5 s

15/100

10%

LCP (Largest Contentful Paint)

Value4.9 s

28/100

25%

SI (Speed Index)

Value7.4 s

28/100

10%

TBT (Total Blocking Time)

Value850 ms

34/100

30%

CLS (Cumulative Layout Shift)

Value0.077

95/100

15%

TTI (Time to Interactive)

Value12.9 s

13/100

10%

Network Requests Diagram

catalogo.zanichelli.it

496 ms

catalogo.zanichelli.it

290 ms

476 ms

gho7ihp.js

257 ms

shop-modal.css

433 ms

Our browser made a total of 65 requests to load all elements on the main page. We found that 3% of them (2 requests) were addressed to the original Catalogo.zanichelli.it, 38% (25 requests) were made to Zanichelli.it and 29% (19 requests) were made to Use.typekit.net. The less responsive or slowest element that took the longest time to load (505 ms) relates to the external source Staticmy.zanichelli.it.

Page Optimization Overview & Recommendations

Page size can be reduced by 131.4 kB (39%)

Content Size

332.8 kB

After Optimization

201.4 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Catalogo.zanichelli.it main page is 332.8 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. 55% of websites need less resources to load. CSS take 108.6 kB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 50.2 kB

  • Original 60.4 kB
  • After minification 55.1 kB
  • After compression 10.3 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 50.2 kB or 83% of the original size.

Image Optimization

-3%

Potential reduce by 2.4 kB

  • Original 91.0 kB
  • After minification 88.6 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. Catalogo Zanichelli images are well optimized though.

JavaScript Optimization

-44%

Potential reduce by 32.3 kB

  • Original 72.8 kB
  • After minification 66.4 kB
  • After compression 40.5 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 32.3 kB or 44% of the original size.

CSS Optimization

-43%

Potential reduce by 46.6 kB

  • Original 108.6 kB
  • After minification 104.9 kB
  • After compression 62.0 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. Catalogo.zanichelli.it needs all CSS files to be minified and compressed as it can save up to 46.6 kB or 43% of the original size.

Requests Breakdown

Number of requests can be reduced by 34 (79%)

Requests Now

43

After Optimization

9

  • Images
  • JavaScript
  • CSS

The browser has sent 43 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Catalogo Zanichelli. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 24 to 1 for JavaScripts and from 12 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

catalogo.zanichelli.it accessibility score

89

Accessibility Issues

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

Buttons do not have an accessible name

High

Links do not have a discernible name

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

catalogo.zanichelli.it best practices score

75

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

catalogo.zanichelli.it SEO score

79

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

High

robots.txt is not valid

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

    IT

  • Language Claimed

    IT

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Catalogo.zanichelli.it can be misinterpreted by Google and other search engines. Our service has detected that Italian is used on the page, and it matches the claimed language. Our system also found out that Catalogo.zanichelli.it 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 Catalogo Zanichelli. 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: