Tools & Wizards About Us
knzb.nl screenshot

Report Summary

  • 38

    Performance

    Renders faster than
    57% of other websites

  • 82

    Accessibility

    Visual factors better than
    that of 52% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 94

    SEO

    Google-friendlier than
    90% of websites

knzb.nl

KNZB | Homepage

Page Load Speed

5.1 sec in total

First Response

462 ms

Resources Loaded

3.6 sec

Page Rendered

1.1 sec

knzb.nl screenshot

About Website

Welcome to knzb.nl homepage info - get ready to check KNZB best content for Netherlands right away, or after learning these important things about knzb.nl

Welkom op de website van de KNZB

Visit knzb.nl

Key Findings

We analyzed Knzb.nl page load time and found that the first response time was 462 ms and then it took 4.6 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.

Performance Metrics

knzb.nl performance score

38

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.3 s

40/100

10%

LCP (Largest Contentful Paint)

Value8.0 s

2/100

25%

SI (Speed Index)

Value6.5 s

39/100

10%

TBT (Total Blocking Time)

Value710 ms

41/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value11.0 s

21/100

10%

Network Requests Diagram

knzb.nl

462 ms

knzb.nl

420 ms

www.knzb.nl

253 ms

css2

42 ms

main.css

7 ms

Our browser made a total of 125 requests to load all elements on the main page. We found that 8% of them (10 requests) were addressed to the original Knzb.nl, 78% (98 requests) were made to Np-knzb-corporate-production.s3-eu-west-1.amazonaws.com and 3% (4 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (1.4 sec) relates to the external source Np-knzb-corporate-production.s3-eu-west-1.amazonaws.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 3.8 MB (32%)

Content Size

11.6 MB

After Optimization

7.9 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Knzb.nl main page is 11.6 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. Only a small number of websites need less resources to load. Images take 10.9 MB which makes up the majority of the site volume.

HTML Optimization

-89%

Potential reduce by 207.3 kB

  • Original 233.0 kB
  • After minification 185.7 kB
  • After compression 25.7 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 47.3 kB, which is 20% 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 207.3 kB or 89% of the original size.

Image Optimization

-30%

Potential reduce by 3.3 MB

  • Original 10.9 MB
  • After minification 7.6 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. Obviously, KNZB needs image optimization as it can save up to 3.3 MB or 30% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-31%

Potential reduce by 87.9 kB

  • Original 281.0 kB
  • After minification 281.0 kB
  • After compression 193.1 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 87.9 kB or 31% of the original size.

CSS Optimization

-87%

Potential reduce by 157.0 kB

  • Original 181.2 kB
  • After minification 171.3 kB
  • After compression 24.2 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. Knzb.nl needs all CSS files to be minified and compressed as it can save up to 157.0 kB or 87% of the original size.

Requests Breakdown

Number of requests can be reduced by 8 (7%)

Requests Now

112

After Optimization

104

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 112 CSS, Javascripts, AJAX and image requests in order to completely render the main page of KNZB. 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

knzb.nl

knzb.nl

462 ms

knzb.nl

knzb.nl

420 ms

www.knzb.nl

www.knzb.nl

253 ms

css2

css2

42 ms

main.css

main.css

7 ms

uc.js

uc.js

99 ms

main.js

main.js

16 ms

gtm.js

gtm.js

130 ms

C8MHS-NZNXJ-MMVPQ-66YWQ-UZ8PS

C8MHS-NZNXJ-MMVPQ-66YWQ-UZ8PS

198 ms

knzb-logo.svg

knzb-logo.svg

427 ms

widget

widget

680 ms

Ontwerp-zonder-titel-8.png

Ontwerp-zonder-titel-8.png

882 ms

Schermafbeelding-2024-05-07-120657.png

Schermafbeelding-2024-05-07-120657.png

857 ms

Ontwerp-zonder-titel-10.png

Ontwerp-zonder-titel-10.png

876 ms

hydrofiel-bestuur.JPG

hydrofiel-bestuur.JPG

634 ms

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583 ms

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668 ms

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675 ms

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51147391412_5d9a7a3e8f_o.jpg

801 ms

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787 ms

piscinas-Virgen-del-Carmen-2.jpg

piscinas-Virgen-del-Carmen-2.jpg

770 ms

Captura3-1.jpg

Captura3-1.jpg

954 ms

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Lifeguard.PNG

957 ms

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51147391412_5d9a7a3e8f_o.jpg

907 ms

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944 ms

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JanKok20210713-50321-scaled_2023-04-13-125823_jofc.jpg

966 ms

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D4HQJvRWAAAG0Hy.jpg

980 ms

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1003 ms

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1032 ms

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1228 ms

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1100 ms

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1053 ms

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1071 ms

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1099 ms

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1133 ms

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1144 ms

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1162 ms

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1172 ms

Zwemmen_Website_1920x1080.png

Zwemmen_Website_1920x1080.png

1378 ms

NLO_RGB_01_Mark-and-Wordmark-in-2-lines-Blue_72dpi.png

NLO_RGB_01_Mark-and-Wordmark-in-2-lines-Blue_72dpi.png

1242 ms

TeamNL_CombiLogo_Odido_RGB.png

TeamNL_CombiLogo_Odido_RGB.png

1252 ms

logo-black-tagline-EN.png

logo-black-tagline-EN.png

1260 ms

Arena_logo.png

Arena_logo.png

1304 ms

tauw-logo-1.png

tauw-logo-1.png

1322 ms

BeGlobal-LogoPayoff-CMYK1-1-removebg-preview.png

BeGlobal-LogoPayoff-CMYK1-1-removebg-preview.png

1332 ms

AZ_Logo_positive_RGB1.png

AZ_Logo_positive_RGB1.png

1358 ms

js

js

79 ms

hotjar-543711.js

hotjar-543711.js

245 ms

config.json

config.json

232 ms

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iJWZBXyIfDnIV5PNhY1KTN7Z-Yh-WYi1UA.ttf

203 ms

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231 ms

iJWZBXyIfDnIV5PNhY1KTN7Z-Yh-NYi1UA.ttf

iJWZBXyIfDnIV5PNhY1KTN7Z-Yh-NYi1UA.ttf

242 ms

iJWZBXyIfDnIV5PNhY1KTN7Z-Yh-4I-1UA.ttf

iJWZBXyIfDnIV5PNhY1KTN7Z-Yh-4I-1UA.ttf

241 ms

DINNextLTPro-Bold.woff

DINNextLTPro-Bold.woff

679 ms

DINNextLTPro-Medium.woff

DINNextLTPro-Medium.woff

660 ms

DINNextLTPro-HeavyItalic.woff

DINNextLTPro-HeavyItalic.woff

778 ms

DINNextLTPro-Regular.woff

DINNextLTPro-Regular.woff

863 ms

DINNextLTPro-Light.woff

DINNextLTPro-Light.woff

853 ms

logo-Zwem-Netwerk.png

logo-Zwem-Netwerk.png

951 ms

modules.404c8789d11e259a4872.js

modules.404c8789d11e259a4872.js

41 ms

Logo-JCF.png

Logo-JCF.png

849 ms

KNZBBusinessclub_logo_kleur_CMYK-5.png

KNZBBusinessclub_logo_kleur_CMYK-5.png

791 ms

Logo-Nextory.png

Logo-Nextory.png

763 ms

virtuoos.png

virtuoos.png

770 ms

website

website

395 ms

varioplay-1.png

varioplay-1.png

675 ms

Treem_Logo-Pay-off_Zwart-1.svg

Treem_Logo-Pay-off_Zwart-1.svg

672 ms

AngelEyeAILogo.svg

AngelEyeAILogo.svg

703 ms

myrtha_transparent.webp

myrtha_transparent.webp

683 ms

Logo_EVA-V31012017-1_2023-01-30-090051_nmkm.png

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654 ms

Slangen_Koenis_Architecten_logo.webp

Slangen_Koenis_Architecten_logo.webp

675 ms

logo-1.png

logo-1.png

626 ms

VDHWaterTechnology-removebg-preview.png

VDHWaterTechnology-removebg-preview.png

639 ms

vpool_brand-1.svg

vpool_brand-1.svg

633 ms

Hellebrekers_Corporate_Logo_Green-Blue.png

Hellebrekers_Corporate_Logo_Green-Blue.png

669 ms

Lotto_Zwemmen_Leaderbord_1500x370.png

Lotto_Zwemmen_Leaderbord_1500x370.png

702 ms

TeamNL_2022-12-05-152254_rakh.jpg

TeamNL_2022-12-05-152254_rakh.jpg

666 ms

Whatsapp-community.png

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686 ms

Amersfoort-City-logo.png

Amersfoort-City-logo.png

633 ms

Blue-Marlins.png

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630 ms

logo-ZPC-AMERSFOORT-lichte-achtergrond-transparant.png

logo-ZPC-AMERSFOORT-lichte-achtergrond-transparant.png

641 ms

floatbutton1_0uA5KIDjSJBNGPeiRDI3YtNcjWJ9mZsPq48NM5iMzp7_jWYVkIHbMtgrDX_xil60_.css

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106 ms

floatbutton1_gCfGdyy4m9jJoPabvs6WeN3_934qNJz-C8-gp4PDdf6RoZA3tvSQTuHLP3BLtZ4B_.js

floatbutton1_gCfGdyy4m9jJoPabvs6WeN3_934qNJz-C8-gp4PDdf6RoZA3tvSQTuHLP3BLtZ4B_.js

138 ms

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Logo-ZPC-Nuenen.png

632 ms

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653 ms

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Logo-BrabantSport-twee-regels-CMYK_2024-02-23-151534_moov.png

618 ms

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629 ms

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611 ms

logo-Zwem-Netwerk.png

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621 ms

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662 ms

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579 ms

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23 ms

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Lotto_Zwemmen_Leaderbord_1500x370.png

579 ms

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Zwemmen_Website_1920x1080.png

666 ms

Logo-Nextory.png

Logo-Nextory.png

552 ms

TeamNL_CombiLogo_Odido_RGB.png

TeamNL_CombiLogo_Odido_RGB.png

560 ms

AZ_Logo_positive_RGB1.png

AZ_Logo_positive_RGB1.png

577 ms

Dutch-Leaders-Logo.png

Dutch-Leaders-Logo.png

561 ms

IMPRO-logo.png

IMPRO-logo.png

579 ms

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595 ms

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547 ms

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563 ms

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566 ms

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565 ms

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575 ms

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594 ms

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577 ms

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543 ms

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tauw-logo-1.png

536 ms

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varioplay-1.png

552 ms

myrtha_transparent.webp

myrtha_transparent.webp

551 ms

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Logo_EVA-V31012017-1_2023-01-30-090051_nmkm.png

555 ms

Slangen_Koenis_Architecten_logo.webp

Slangen_Koenis_Architecten_logo.webp

563 ms

logo-1.png

logo-1.png

530 ms

Logo-JCF.png

Logo-JCF.png

536 ms

BeGlobal-LogoPayoff-CMYK1-1-removebg-preview.png

BeGlobal-LogoPayoff-CMYK1-1-removebg-preview.png

509 ms

logo-black-tagline-EN.png

logo-black-tagline-EN.png

528 ms

Arena_logo.png

Arena_logo.png

539 ms

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amari-vision.png

543 ms

VDHWaterTechnology-removebg-preview.png

VDHWaterTechnology-removebg-preview.png

536 ms

virtuoos.png

virtuoos.png

530 ms

Hellebrekers_Corporate_Logo_Green-Blue.png

Hellebrekers_Corporate_Logo_Green-Blue.png

528 ms

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NLO_RGB_01_Mark-and-Wordmark-in-2-lines-Blue_72dpi.png

525 ms

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knzb-logo-white.svg

532 ms

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MijnZwemcoach-036.jpg

574 ms

Accessibility Review

knzb.nl accessibility score

82

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

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

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

Best Practices

knzb.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

Missing source maps for large first-party JavaScript

SEO Factors

knzb.nl SEO score

94

Search Engine Optimization Advices

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

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 Knzb.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 Knzb.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

knzb.nl

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