Tools & Wizards About Us
ster.nl screenshot

Report Summary

  • 28

    Performance

    Renders faster than
    48% of other websites

  • 58

    Accessibility

    Visual factors better than
    that of 25% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 91

    SEO

    Google-friendlier than
    70% of websites

ster.nl

Ster Reclame: Tv, Radio en Online Adverteren bij NPO

Page Load Speed

3.9 sec in total

First Response

479 ms

Resources Loaded

2.9 sec

Page Rendered

525 ms

ster.nl screenshot

About Website

Visit ster.nl now to see the best up-to-date Ster content for Netherlands and also check out these interesting facts you probably never knew about ster.nl

Klaar voor het grote publiek? Adverteer rondom de topprogrammering van de NPO via tv, radio en online. Groot bereik. Toegankelijk & betrouwbaar.

Visit ster.nl

Key Findings

We analyzed Ster.nl page load time and found that the first response time was 479 ms and then it took 3.4 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.

Performance Metrics

ster.nl performance score

28

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.0 s

50/100

10%

LCP (Largest Contentful Paint)

Value4.8 s

30/100

25%

SI (Speed Index)

Value6.8 s

34/100

10%

TBT (Total Blocking Time)

Value2,280 ms

5/100

30%

CLS (Cumulative Layout Shift)

Value0.188

65/100

15%

TTI (Time to Interactive)

Value14.5 s

9/100

10%

Network Requests Diagram

ster.nl

479 ms

uc.js

24 ms

app.css

269 ms

polyfill.min.js

361 ms

aspnet-validation.min.js

362 ms

Our browser made a total of 49 requests to load all elements on the main page. We found that 71% of them (35 requests) were addressed to the original Ster.nl, 24% (12 requests) were made to Images.ster.nl and 2% (1 request) were made to Consent.cookiebot.com. The less responsive or slowest element that took the longest time to load (1.7 sec) relates to the external source Images.ster.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 512.1 kB (30%)

Content Size

1.7 MB

After Optimization

1.2 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Ster.nl main page is 1.7 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. 40% of websites need less resources to load. Javascripts take 1.4 MB which makes up the majority of the site volume.

HTML Optimization

-82%

Potential reduce by 69.4 kB

  • Original 84.3 kB
  • After minification 64.0 kB
  • After compression 14.9 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 20.3 kB, which is 24% 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 69.4 kB or 82% of the original size.

Image Optimization

-7%

Potential reduce by 12.2 kB

  • Original 171.5 kB
  • After minification 159.3 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. Ster images are well optimized though.

JavaScript Optimization

-30%

Potential reduce by 409.7 kB

  • Original 1.4 MB
  • After minification 1.4 MB
  • After compression 966.7 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 409.7 kB or 30% of the original size.

CSS Optimization

-33%

Potential reduce by 20.8 kB

  • Original 63.7 kB
  • After minification 63.7 kB
  • After compression 42.9 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. Ster.nl needs all CSS files to be minified and compressed as it can save up to 20.8 kB or 33% of the original size.

Requests Breakdown

Number of requests can be reduced by 22 (50%)

Requests Now

44

After Optimization

22

  • Images
  • JavaScript
  • CSS

The browser has sent 44 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Ster. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 9 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

ster.nl

ster.nl

479 ms

uc.js

uc.js

24 ms

app.css

app.css

269 ms

polyfill.min.js

polyfill.min.js

361 ms

aspnet-validation.min.js

aspnet-validation.min.js

362 ms

index-oIopnMIE.js

index-oIopnMIE.js

1073 ms

web-vitals-h7xukfVX.js

web-vitals-h7xukfVX.js

449 ms

index-AQsfOdLq.css

index-AQsfOdLq.css

448 ms

app.js

app.js

442 ms

jquery.unobtrusive-ajax.min.js

jquery.unobtrusive-ajax.min.js

396 ms

ster-login-button.js

ster-login-button.js

841 ms

api.js

api.js

11 ms

dsc_5848.jpg

dsc_5848.jpg

858 ms

footer-nav-caret.svg

footer-nav-caret.svg

137 ms

icon-calendar.svg

icon-calendar.svg

177 ms

search-icon.svg

search-icon.svg

204 ms

npo_radio_1_logo.svg

npo_radio_1_logo.svg

211 ms

npo_radio_2_logo.svg

npo_radio_2_logo.svg

222 ms

npo_3fm_logo.svg

npo_3fm_logo.svg

246 ms

npoklassiek_logo_fc_rgb.png

npoklassiek_logo_fc_rgb.png

286 ms

npo_radio_5_logo.svg

npo_radio_5_logo.svg

316 ms

npo_funx_logo-1.svg

npo_funx_logo-1.svg

328 ms

npo_1_logo.svg

npo_1_logo.svg

349 ms

npo_2_logo.svg

npo_2_logo.svg

400 ms

npo_3_logo.svg

npo_3_logo.svg

423 ms

npo_start_logo.svg

npo_start_logo.svg

443 ms

rpo-logo-rgb.png

rpo-logo-rgb.png

465 ms

loading.svg

loading.svg

494 ms

ster-icoon-event_voetbal-wit.png

ster-icoon-event_voetbal-wit.png

529 ms

money-label.svg

money-label.svg

559 ms

insights.svg

insights.svg

575 ms

social-facebook.svg

social-facebook.svg

588 ms

social-linkedin.svg

social-linkedin.svg

623 ms

social-instagram.svg

social-instagram.svg

627 ms

gerben-teela-2mrf4360.jpg

gerben-teela-2mrf4360.jpg

1280 ms

anp-476483561-1.jpg

anp-476483561-1.jpg

1339 ms

top2000_20231231_fotograafemmapot_7vi05422_hq.jpg

top2000_20231231_fotograafemmapot_7vi05422_hq.jpg

1313 ms

microsoftteams-image-5.png

microsoftteams-image-5.png

1308 ms

nathanreinds-3fm8-lr-8.jpg

nathanreinds-3fm8-lr-8.jpg

1304 ms

zappend-gzin-3.jpg

zappend-gzin-3.jpg

1317 ms

radio1-avrotros-npo.jpg

radio1-avrotros-npo.jpg

1717 ms

radio2.jpg

radio2.jpg

1733 ms

dsc_5848.jpg

dsc_5848.jpg

1713 ms

ster5.jpg

ster5.jpg

1736 ms

2021-02-28mrf-1332-crop2.jpg

2021-02-28mrf-1332-crop2.jpg

1717 ms

roboto-400-regular.woff

roboto-400-regular.woff

562 ms

roboto-700.woff

roboto-700.woff

600 ms

TradeGothic-BoldCondTwenty.woff

TradeGothic-BoldCondTwenty.woff

600 ms

49b53bd52c9ef1a0--clrkb-F.woff

49b53bd52c9ef1a0--clrkb-F.woff

652 ms

Accessibility Review

ster.nl accessibility score

58

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

[aria-*] attributes do not match their roles

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

High

ARIA IDs are not unique

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

Form elements do not have associated labels

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

[id] attributes on active, focusable elements are not unique

High

Heading elements are not in a sequentially-descending order

Best Practices

ster.nl best practices score

83

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

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

ster.nl SEO score

91

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

    NL

  • Language Claimed

    NL

  • Encoding

    UTF-8

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

ster.nl

Open Graph data is detected on the main page of Ster. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: