Report Summary

  • 12

    Performance

    Renders faster than
    25% of other websites

  • 76

    Accessibility

    Visual factors better than
    that of 44% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    82% of websites

  • 90

    SEO

    Google-friendlier than
    69% of websites

kongresshaus.ch

Kongresshaus Zürich Home | Willkommen - Kongresshaus Zürich

Page Load Speed

4.4 sec in total

First Response

1.1 sec

Resources Loaded

2.9 sec

Page Rendered

373 ms

kongresshaus.ch screenshot

About Website

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

Wiedereröffnung im Sommer 2021: Das moderne Veranstaltungszentrum liegt an bester Lage mitten in Zürich und bietet Raum für Events jeder Grösse.

Visit kongresshaus.ch

Key Findings

We analyzed Kongresshaus.ch page load time and found that the first response time was 1.1 sec and then it took 3.3 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

kongresshaus.ch performance score

12

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.2 s

8/100

10%

LCP (Largest Contentful Paint)

Value21.0 s

0/100

25%

SI (Speed Index)

Value20.8 s

0/100

10%

TBT (Total Blocking Time)

Value8,750 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.15

76/100

15%

TTI (Time to Interactive)

Value26.2 s

0/100

10%

Network Requests Diagram

home.html

1105 ms

stylesheet_413990db01.css

497 ms

jquery.fancybox.css

494 ms

styles.css

581 ms

modernizr-2.6.2.min.js

584 ms

Our browser made a total of 26 requests to load all elements on the main page. We found that all of those requests were addressed to Kongresshaus.ch and no external sources were called. The less responsive or slowest element that took the longest time to load (1.1 sec) belongs to the original domain Kongresshaus.ch.

Page Optimization Overview & Recommendations

Page size can be reduced by 176.3 kB (24%)

Content Size

750.2 kB

After Optimization

573.8 kB

In fact, the total size of Kongresshaus.ch main page is 750.2 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. 30% of websites need less resources to load. Images take 507.8 kB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 16.3 kB

  • Original 21.0 kB
  • After minification 17.1 kB
  • After compression 4.7 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 3.9 kB, which is 19% 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 16.3 kB or 78% of the original size.

Image Optimization

-0%

Potential reduce by 2.5 kB

  • Original 507.8 kB
  • After minification 505.3 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. Kongresshaus images are well optimized though.

JavaScript Optimization

-69%

Potential reduce by 125.3 kB

  • Original 182.0 kB
  • After minification 164.0 kB
  • After compression 56.7 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 125.3 kB or 69% of the original size.

CSS Optimization

-82%

Potential reduce by 32.3 kB

  • Original 39.4 kB
  • After minification 30.5 kB
  • After compression 7.2 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. Kongresshaus.ch needs all CSS files to be minified and compressed as it can save up to 32.3 kB or 82% of the original size.

Requests Breakdown

Number of requests can be reduced by 8 (35%)

Requests Now

23

After Optimization

15

The browser has sent 23 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Kongresshaus. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 6 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

kongresshaus.ch accessibility score

76

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

Elements with an ARIA [role] that require children to contain a specific [role] are missing some or all of those required children.

High

[role]s are not contained by their required parent element

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

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

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

List items (<li>) are not contained within <ul> or <ol> parent elements.

Best Practices

kongresshaus.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

Page has valid source maps

SEO Factors

kongresshaus.ch SEO score

90

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

    DE

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Kongresshaus.ch can be misinterpreted by Google and other search engines. Our service has detected that German is used on the page, and it does not match the claimed English language. Our system also found out that Kongresshaus.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 Kongresshaus. 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: