Report Summary

  • 16

    Performance

    Renders faster than
    30% of other websites

  • 84

    Accessibility

    Visual factors better than
    that of 57% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 84

    SEO

    Google-friendlier than
    53% of websites

hlz.nl

HLZ | Middelbare school in Amsterdam voor havo & vwo

Page Load Speed

10.3 sec in total

First Response

2.9 sec

Resources Loaded

6.6 sec

Page Rendered

746 ms

hlz.nl screenshot

About Website

Click here to check amazing HLZ content for Netherlands. Otherwise, check out these important facts you probably never knew about hlz.nl

In ons kleinschalige en sfeervolle schoolgebouw, midden in Amsterdam Zuid, hebben we alle ervaring en kundigheid in huis om leerlingen te laten groeien.

Visit hlz.nl

Key Findings

We analyzed Hlz.nl page load time and found that the first response time was 2.9 sec and then it took 7.4 sec to load all DOM resources and completely render a web page. This is a poor result, as 80% of websites can load faster.

Performance Metrics

hlz.nl performance score

16

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value11.3 s

0/100

10%

LCP (Largest Contentful Paint)

Value16.1 s

0/100

25%

SI (Speed Index)

Value19.0 s

0/100

10%

TBT (Total Blocking Time)

Value2,290 ms

5/100

30%

CLS (Cumulative Layout Shift)

Value0.061

97/100

15%

TTI (Time to Interactive)

Value32.0 s

0/100

10%

Network Requests Diagram

hlz.nl

2920 ms

wp-emoji-release.min.js

494 ms

jquery.magnificpopup.css

272 ms

2-layout.css

276 ms

font-awesome.min.css

370 ms

Our browser made a total of 42 requests to load all elements on the main page. We found that 83% of them (35 requests) were addressed to the original Hlz.nl, 5% (2 requests) were made to S.ytimg.com and 2% (1 request) were made to Fonts.googleapis.com. The less responsive or slowest element that took the longest time to load (3.3 sec) belongs to the original domain Hlz.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 663.0 kB (12%)

Content Size

5.7 MB

After Optimization

5.0 MB

In fact, the total size of Hlz.nl main page is 5.7 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. 30% of websites need less resources to load. Images take 5.0 MB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 25.4 kB

  • Original 33.0 kB
  • After minification 30.1 kB
  • After compression 7.6 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 25.4 kB or 77% of the original size.

Image Optimization

-3%

Potential reduce by 135.8 kB

  • Original 5.0 MB
  • After minification 4.8 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. HLZ images are well optimized though.

JavaScript Optimization

-65%

Potential reduce by 137.9 kB

  • Original 211.1 kB
  • After minification 211.0 kB
  • After compression 73.2 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 137.9 kB or 65% of the original size.

CSS Optimization

-83%

Potential reduce by 364.0 kB

  • Original 440.1 kB
  • After minification 432.2 kB
  • After compression 76.1 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. Hlz.nl needs all CSS files to be minified and compressed as it can save up to 364.0 kB or 83% of the original size.

Requests Breakdown

Number of requests can be reduced by 9 (22%)

Requests Now

41

After Optimization

32

The browser has sent 41 CSS, Javascripts, AJAX and image requests in order to completely render the main page of HLZ. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 4 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

hlz.nl accessibility score

84

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

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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

hlz.nl best practices score

67

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

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

hlz.nl SEO score

84

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

    NL

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Hlz.nl can be misinterpreted by Google and other search engines. Our service has detected that Dutch is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Hlz.nl 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 data is detected on the main page of HLZ. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: