Tools & Wizards About Us
schoolboekenthuis.nl screenshot

Report Summary

  • 34

    Performance

    Renders faster than
    54% of other websites

  • 78

    Accessibility

    Visual factors better than
    that of 45% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 79

    SEO

    Google-friendlier than
    40% of websites

schoolboekenthuis.nl

Schoolboekenthuis - Alle basisschoolboeken per stuk leverbaar!

Page Load Speed

4.6 sec in total

First Response

261 ms

Resources Loaded

3.9 sec

Page Rendered

406 ms

schoolboekenthuis.nl screenshot

About Website

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

Op SchoolboekenThuis.nl vind je de meest actuele lesmethoden en een uitgebreid assortiment oefenmateriaal en zelfstandig werkboekjes voor het basisonderwijs. Daarnaast hebben we een zeer ruim assortim...

Visit schoolboekenthuis.nl

Key Findings

We analyzed Schoolboekenthuis.nl page load time and found that the first response time was 261 ms and then it took 4.3 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

schoolboekenthuis.nl performance score

34

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.0 s

9/100

10%

LCP (Largest Contentful Paint)

Value12.9 s

0/100

25%

SI (Speed Index)

Value7.7 s

25/100

10%

TBT (Total Blocking Time)

Value610 ms

49/100

30%

CLS (Cumulative Layout Shift)

Value0.134

80/100

15%

TTI (Time to Interactive)

Value8.2 s

41/100

10%

Network Requests Diagram

schoolboekenthuis.nl

261 ms

www.schoolboekenthuis.nl

1228 ms

jquery-1.4.2.js

186 ms

cufon-yui.js

275 ms

Myriad_Pro_700.font.js

557 ms

Our browser made a total of 70 requests to load all elements on the main page. We found that 80% of them (56 requests) were addressed to the original Schoolboekenthuis.nl, 10% (7 requests) were made to Kiyoh.com and 3% (2 requests) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (1.2 sec) belongs to the original domain Schoolboekenthuis.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 293.7 kB (15%)

Content Size

2.0 MB

After Optimization

1.7 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Schoolboekenthuis.nl main page is 2.0 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. 55% of websites need less resources to load. Images take 1.4 MB which makes up the majority of the site volume.

HTML Optimization

-84%

Potential reduce by 105.5 kB

  • Original 125.5 kB
  • After minification 110.4 kB
  • After compression 20.0 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 15.2 kB, which is 12% 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 105.5 kB or 84% of the original size.

Image Optimization

-3%

Potential reduce by 47.9 kB

  • Original 1.4 MB
  • After minification 1.3 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. Schoolboekenthuis images are well optimized though.

JavaScript Optimization

-30%

Potential reduce by 129.5 kB

  • Original 434.5 kB
  • After minification 434.5 kB
  • After compression 305.0 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 129.5 kB or 30% of the original size.

CSS Optimization

-41%

Potential reduce by 10.8 kB

  • Original 26.3 kB
  • After minification 26.1 kB
  • After compression 15.5 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. Schoolboekenthuis.nl needs all CSS files to be minified and compressed as it can save up to 10.8 kB or 41% of the original size.

Requests Breakdown

Number of requests can be reduced by 18 (27%)

Requests Now

67

After Optimization

49

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 67 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Schoolboekenthuis. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 11 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

schoolboekenthuis.nl

schoolboekenthuis.nl

261 ms

www.schoolboekenthuis.nl

www.schoolboekenthuis.nl

1228 ms

jquery-1.4.2.js

jquery-1.4.2.js

186 ms

cufon-yui.js

cufon-yui.js

275 ms

Myriad_Pro_700.font.js

Myriad_Pro_700.font.js

557 ms

ad5e141b1fb692a508590c3b4813bdd9.css

ad5e141b1fb692a508590c3b4813bdd9.css

312 ms

577c8dbfe53b84c9fac930785a010feb.css

577c8dbfe53b84c9fac930785a010feb.css

368 ms

bf1727d29ef8a98adcfaa8e20a258ace.js

bf1727d29ef8a98adcfaa8e20a258ace.js

642 ms

giro-eps.js

giro-eps.js

486 ms

js

js

90 ms

infinite_carousel.js

infinite_carousel.js

303 ms

api.js

api.js

45 ms

ga.js

ga.js

58 ms

gtm.js

gtm.js

56 ms

bg.gif

bg.gif

105 ms

tile.gif

tile.gif

116 ms

logo.gif

logo.gif

117 ms

btn_search.gif

btn_search.gif

116 ms

retrieve-widget.html

retrieve-widget.html

524 ms

234x60no.gif

234x60no.gif

945 ms

Thuiswinkel_Waarborg_Kleur_Verticaal-50.jpg

Thuiswinkel_Waarborg_Kleur_Verticaal-50.jpg

100 ms

nav.gif

nav.gif

100 ms

sub.gif

sub.gif

132 ms

prev.png

prev.png

164 ms

next.png

next.png

165 ms

scroller_place.gif

scroller_place.gif

163 ms

atlantis-vakantieboek-start.jpg

atlantis-vakantieboek-start.jpg

181 ms

txt_shape.gif

txt_shape.gif

183 ms

9789021685656_1.jpg

9789021685656_1.jpg

311 ms

9789401499996.jpg

9789401499996.jpg

345 ms

9789048746736.jpg

9789048746736.jpg

255 ms

9789048749492.jpg

9789048749492.jpg

257 ms

9789048749393.jpg

9789048749393.jpg

272 ms

9789048749768.jpg

9789048749768.jpg

364 ms

9789048747818.jpg

9789048747818.jpg

348 ms

9789048747658.jpg

9789048747658.jpg

440 ms

9789048747733.jpg

9789048747733.jpg

363 ms

9789043934244.jpg

9789043934244.jpg

402 ms

eng_tkw_junior_doosje.jpg

eng_tkw_junior_doosje.jpg

524 ms

nederlands_taalkwartet_junior_doosje_350x385_1.jpg

nederlands_taalkwartet_junior_doosje_350x385_1.jpg

439 ms

9789491263378.jpg

9789491263378.jpg

454 ms

g4s_franstaalkwartetjr_packshot_los-250x250.jpg

g4s_franstaalkwartetjr_packshot_los-250x250.jpg

546 ms

2024-zomerbanner-ga-je-nog-iets-leuks-doen.jpg

2024-zomerbanner-ga-je-nog-iets-leuks-doen.jpg

581 ms

2024-zomer-doe-web.jpg

2024-zomer-doe-web.jpg

532 ms

2024-zomer-leren-web.jpg

2024-zomer-leren-web.jpg

623 ms

collage-zwijsen-VLL-zoem-werkboekjes.jpg

collage-zwijsen-VLL-zoem-werkboekjes.jpg

544 ms

PS_3_visual.jpg

PS_3_visual.jpg

794 ms

collage-wijzeroverdebasisschool-vakantierekenen-350.jpg

collage-wijzeroverdebasisschool-vakantierekenen-350.jpg

625 ms

banner-2023-actie-stapvoorstap-v02.jpg

banner-2023-actie-stapvoorstap-v02.jpg

636 ms

banner-opruiming-2022.jpg

banner-opruiming-2022.jpg

639 ms

btn_cart.gif

btn_cart.gif

671 ms

abonneer_op_nieuwsbrief.jpg

abonneer_op_nieuwsbrief.jpg

713 ms

__utm.gif

__utm.gif

18 ms

Thuiswinkel_Waarborg_Kleur_Horizontaal-250.jpg

Thuiswinkel_Waarborg_Kleur_Horizontaal-250.jpg

660 ms

bannerpaypal-sofort-mistercash-riverty.jpg

bannerpaypal-sofort-mistercash-riverty.jpg

633 ms

comodo-secure-ssl.jpg

comodo-secure-ssl.jpg

640 ms

comodo-circle_master21.gif

comodo-circle_master21.gif

666 ms

Ecommerce_Europe_Trustmark_logo_transparant.jpg

Ecommerce_Europe_Trustmark_logo_transparant.jpg

707 ms

banner_binnen2-5werkdagenbezorgd.jpg

banner_binnen2-5werkdagenbezorgd.jpg

710 ms

banner-myparcel.jpg

banner-myparcel.jpg

690 ms

PostNL_Bezorgd1_gratisthuisbezorgen50.jpg

PostNL_Bezorgd1_gratisthuisbezorgen50.jpg

667 ms

spinner.gif

spinner.gif

691 ms

close-button.png

close-button.png

721 ms

thuiswinkel-widget.css

thuiswinkel-widget.css

431 ms

kiyoh-widget.js

kiyoh-widget.js

366 ms

tw_waarborg_logo_1.png

tw_waarborg_logo_1.png

395 ms

tw_waarborg_logo_2.png

tw_waarborg_logo_2.png

362 ms

cff69b2c0a5f32626dd2c43ef3de0101.css

cff69b2c0a5f32626dd2c43ef3de0101.css

91 ms

tw_rating_135.png

tw_rating_135.png

356 ms

tw_arrows.png

tw_arrows.png

360 ms

Accessibility Review

schoolboekenthuis.nl accessibility score

78

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

Form elements do not have associated labels

High

Links do not have a discernible name

Best Practices

schoolboekenthuis.nl best practices score

58

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

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

SEO Factors

schoolboekenthuis.nl SEO score

79

Search Engine Optimization Advices

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 Schoolboekenthuis.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 Schoolboekenthuis.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

schoolboekenthuis.nl

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