Tools & Wizards About Us
sterko.nl screenshot

Report Summary

  • 96

    Performance

    Renders faster than
    94% of other websites

  • 69

    Accessibility

    Visual factors better than
    that of 34% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 77

    SEO

    Google-friendlier than
    36% of websites

sterko.nl

Groveko - Groothandel in schoonmaakartikelen & schoonmaakmiddelen | Innovatief in schoon

Page Load Speed

1.7 sec in total

First Response

376 ms

Resources Loaded

1.1 sec

Page Rendered

223 ms

sterko.nl screenshot

About Website

Click here to check amazing Sterko content. Otherwise, check out these important facts you probably never knew about sterko.nl

Groveko is de schoonmaakgroothandel voor innovatie en duurzaamheid in de schoonmaak. Samen lossen we jouw schoonmaakvraagstukken op!

Visit sterko.nl

Key Findings

We analyzed Sterko.nl page load time and found that the first response time was 376 ms and then it took 1.3 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 25% of websites can load faster.

Performance Metrics

sterko.nl performance score

96

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.8 s

90/100

10%

LCP (Largest Contentful Paint)

Value2.5 s

90/100

25%

SI (Speed Index)

Value2.0 s

99/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value1.8 s

100/100

10%

Network Requests Diagram

sterko.nl

376 ms

css

38 ms

combined-min.css

257 ms

_sltlds.js

340 ms

reserved-min.js

412 ms

Our browser made a total of 16 requests to load all elements on the main page. We found that 6% of them (1 request) were addressed to the original Sterko.nl, 75% (12 requests) were made to Reserved.transip.nl and 13% (2 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (685 ms) relates to the external source Reserved.transip.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 59.2 kB (12%)

Content Size

493.1 kB

After Optimization

433.8 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Sterko.nl main page is 493.1 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. 25% of websites need less resources to load. Images take 405.6 kB which makes up the majority of the site volume.

HTML Optimization

-87%

Potential reduce by 56.7 kB

  • Original 64.8 kB
  • After minification 45.7 kB
  • After compression 8.1 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 19.1 kB, which is 29% 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 56.7 kB or 87% of the original size.

Image Optimization

-1%

Potential reduce by 2.5 kB

  • Original 405.6 kB
  • After minification 403.1 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. Sterko images are well optimized though.

JavaScript Optimization

-2%

Potential reduce by 27 B

  • Original 1.3 kB
  • After minification 1.3 kB
  • After compression 1.3 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. This website has mostly compressed JavaScripts.

CSS Optimization

-0%

Potential reduce by 4 B

  • Original 21.4 kB
  • After minification 21.4 kB
  • After compression 21.4 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. Sterko.nl has all CSS files already compressed.

Requests Breakdown

We found no issues to fix!

Requests Now

13

After Optimization

13

  • Images
  • JavaScript
  • CSS

The browser has sent 13 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Sterko. According to our analytics all requests are already optimized.

Network Requests Diagram

sterko.nl

sterko.nl

376 ms

css

css

38 ms

combined-min.css

combined-min.css

257 ms

_sltlds.js

_sltlds.js

340 ms

reserved-min.js

reserved-min.js

412 ms

headerphoto_reduced.jpg

headerphoto_reduced.jpg

583 ms

headerphoto_mobile_reduced.jpg

headerphoto_mobile_reduced.jpg

502 ms

questionbox_mobile.jpg

questionbox_mobile.jpg

685 ms

questionbox_desktop.jpg

questionbox_desktop.jpg

596 ms

bringit_desktop_reduced.jpg

bringit_desktop_reduced.jpg

521 ms

bringit_mobile_reduced.jpg

bringit_mobile_reduced.jpg

582 ms

trustpilot.jpg

trustpilot.jpg

590 ms

thumbup.jpg

thumbup.jpg

613 ms

close-button.png

close-button.png

670 ms

6xKydSBYKcSV-LCoeQqfX1RYOo3iu4nwlxdr.ttf

6xKydSBYKcSV-LCoeQqfX1RYOo3iu4nwlxdr.ttf

18 ms

6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7g.ttf

6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7g.ttf

22 ms

Accessibility Review

sterko.nl accessibility score

69

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

Image elements do not have [alt] attributes

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.

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

sterko.nl 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

SEO Factors

sterko.nl SEO score

77

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Page is blocked from indexing

High

robots.txt is not valid

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

Language and Encoding

  • Language Detected

    NL

  • Language Claimed

    N/A

  • Encoding

    ASCII

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Sterko.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 Sterko.nl main page’s claimed encoding is ascii. 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

sterko.nl

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