Tools & Wizards About Us
zkkf.nl screenshot

Report Summary

  • 61

    Performance

    Renders faster than
    76% of other websites

  • 72

    Accessibility

    Visual factors better than
    that of 37% of websites

  • 50

    Best Practices

    More advanced features
    available than in
    19% of websites

  • 69

    SEO

    Google-friendlier than
    28% of websites

zkkf.nl

Zwetsloot Kunststof kozijnen Fabriek ramen deuren en schuifpuien of openslaande deuren van kunststof

Page Load Speed

3.2 sec in total

First Response

505 ms

Resources Loaded

2.5 sec

Page Rendered

122 ms

zkkf.nl screenshot

About Website

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

Producent kunststof kozijnen ramen en deuren, wij leveren (en monteren) kunststof kozijnen aan particulieren en aannemers met snelle levertijd in heel nederland, bezoek de showroom.

Visit zkkf.nl

Key Findings

We analyzed Zkkf.nl page load time and found that the first response time was 505 ms and then it took 2.7 sec to load all DOM resources and completely render a web page. This is a poor result, as 50% of websites can load faster.

Performance Metrics

zkkf.nl performance score

61

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.2 s

78/100

10%

LCP (Largest Contentful Paint)

Value2.2 s

95/100

25%

SI (Speed Index)

Value4.2 s

78/100

10%

TBT (Total Blocking Time)

Value1,390 ms

16/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value11.5 s

18/100

10%

Network Requests Diagram

zkkf.nl

505 ms

css-layout.css

196 ms

zkkf.css

199 ms

lightbox.css

188 ms

stylesheet.css

203 ms

Our browser made a total of 95 requests to load all elements on the main page. We found that 74% of them (70 requests) were addressed to the original Zkkf.nl, 20% (19 requests) were made to Gravatar.com and 2% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (1.6 sec) belongs to the original domain Zkkf.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 431.2 kB (35%)

Content Size

1.2 MB

After Optimization

794.0 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Zkkf.nl main page is 1.2 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 609.1 kB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 129.0 kB

  • Original 158.9 kB
  • After minification 158.5 kB
  • After compression 29.9 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. 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 129.0 kB or 81% of the original size.

Image Optimization

-2%

Potential reduce by 10.5 kB

  • Original 609.1 kB
  • After minification 598.6 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. Zkkf images are well optimized though.

JavaScript Optimization

-63%

Potential reduce by 274.2 kB

  • Original 437.0 kB
  • After minification 430.2 kB
  • After compression 162.8 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 274.2 kB or 63% of the original size.

CSS Optimization

-87%

Potential reduce by 17.6 kB

  • Original 20.2 kB
  • After minification 9.8 kB
  • After compression 2.6 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. Zkkf.nl needs all CSS files to be minified and compressed as it can save up to 17.6 kB or 87% of the original size.

Requests Breakdown

Number of requests can be reduced by 45 (48%)

Requests Now

93

After Optimization

48

  • Images
  • JavaScript
  • CSS

The browser has sent 93 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Zkkf. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

zkkf.nl

zkkf.nl

505 ms

css-layout.css

css-layout.css

196 ms

zkkf.css

zkkf.css

199 ms

lightbox.css

lightbox.css

188 ms

stylesheet.css

stylesheet.css

203 ms

jquery.min.js

jquery.min.js

9 ms

lightbox.js

lightbox.js

200 ms

lightboxaddthis.js

lightboxaddthis.js

253 ms

ga.js

ga.js

44 ms

star_full.png

star_full.png

271 ms

21a0217cfbd376ec737dd99ae614fd75.png

21a0217cfbd376ec737dd99ae614fd75.png

71 ms

facebook.png

facebook.png

468 ms

google.png

google.png

476 ms

myspace.png

myspace.png

478 ms

twitter.png

twitter.png

455 ms

linkedin.png

linkedin.png

457 ms

reply.png

reply.png

474 ms

up.png

up.png

647 ms

down.png

down.png

635 ms

star_empty.png

star_empty.png

679 ms

voordeur_zijraam_rood_sassenheim-klein.jpg

voordeur_zijraam_rood_sassenheim-klein.jpg

847 ms

voordeur_golden_oak_noordwijk-klein.jpg

voordeur_golden_oak_noordwijk-klein.jpg

1273 ms

rss.jpg

rss.jpg

684 ms

bold.png

bold.png

810 ms

italic.png

italic.png

826 ms

underline.png

underline.png

909 ms

strike.png

strike.png

911 ms

superscript.png

superscript.png

1010 ms

subscript.png

subscript.png

1007 ms

code.png

code.png

1019 ms

php_code.png

php_code.png

1095 ms

quote.png

quote.png

1096 ms

line.png

line.png

1190 ms

list_bullet.png

list_bullet.png

1184 ms

list_numeric.png

list_numeric.png

1188 ms

link.png

link.png

1282 ms

email.png

email.png

1283 ms

image.png

image.png

1365 ms

video.png

video.png

1363 ms

smile.gif

smile.gif

1378 ms

sad.gif

sad.gif

1445 ms

huh.gif

huh.gif

1462 ms

laugh.gif

laugh.gif

1481 ms

mad.gif

mad.gif

1555 ms

tongue.gif

tongue.gif

1559 ms

crying.gif

crying.gif

1564 ms

offerte-aanvragen.png

offerte-aanvragen.png

194 ms

contact.png

contact.png

629 ms

star_full.png

star_full.png

211 ms

zijkant2.jpg

zijkant2.jpg

282 ms

entreeklein.jpg

entreeklein.jpg

360 ms

gilzkkf1klein.jpg

gilzkkf1klein.jpg

280 ms

opsldeurgr-klein.jpg

opsldeurgr-klein.jpg

545 ms

belpop3klein.jpg

belpop3klein.jpg

392 ms

verzetvleugelkleinst.jpg

verzetvleugelkleinst.jpg

568 ms

verspringingglaslijnklein.jpg

verspringingglaslijnklein.jpg

562 ms

opbouwklein.jpg

opbouwklein.jpg

657 ms

aalhorstklein.jpg

aalhorstklein.jpg

665 ms

doorndeurklein.jpg

doorndeurklein.jpg

900 ms

werkplaatsnov05klein.jpg

werkplaatsnov05klein.jpg

854 ms

kozijn8-klein.jpg

kozijn8-klein.jpg

1267 ms

a051a0cb3a1504b4ebc8045637e35432.png

a051a0cb3a1504b4ebc8045637e35432.png

74 ms

de8a5d0ce183de2d63e9337b06746ca5.png

de8a5d0ce183de2d63e9337b06746ca5.png

145 ms

2722c268bd5dd73e2e944d7615b131d4.png

2722c268bd5dd73e2e944d7615b131d4.png

145 ms

6fb0dc383ceccd43ea6ba98b86559343.png

6fb0dc383ceccd43ea6ba98b86559343.png

145 ms

9500b91ae96dc3f1ed6f3f2b3f2add5b.png

9500b91ae96dc3f1ed6f3f2b3f2add5b.png

145 ms

47b0c4b8b76250f5d74f0ab8b1d663be.png

47b0c4b8b76250f5d74f0ab8b1d663be.png

146 ms

edcf77b8c99081fbb30ed1163ada834f.png

edcf77b8c99081fbb30ed1163ada834f.png

145 ms

c4a5ecfd678eea9f9cd050759437bca2.png

c4a5ecfd678eea9f9cd050759437bca2.png

145 ms

b53f30894e0cf4f5d166d355a44ff227.png

b53f30894e0cf4f5d166d355a44ff227.png

146 ms

8e1d10587f0af9894f544db1861614b2.png

8e1d10587f0af9894f544db1861614b2.png

146 ms

0c761423d570a4a071a1671a847418bc.png

0c761423d570a4a071a1671a847418bc.png

146 ms

612be40cd82f253ccb7b9188aede07ca.png

612be40cd82f253ccb7b9188aede07ca.png

146 ms

c280506ef46184d668a7e7d0ab131b84.png

c280506ef46184d668a7e7d0ab131b84.png

146 ms

f64e2f2fa191e3951105de082e890c43.png

f64e2f2fa191e3951105de082e890c43.png

160 ms

ebaf1de32cf7f9cd41e1d46db896aa70.png

ebaf1de32cf7f9cd41e1d46db896aa70.png

167 ms

226a58a6f83a26f344f409e7cc5be6ee.png

226a58a6f83a26f344f409e7cc5be6ee.png

167 ms

b045ebb392f9a88553101093fdb072d8.png

b045ebb392f9a88553101093fdb072d8.png

168 ms

e7bd0669312d4ec6cedfa50eda1f32f1.png

e7bd0669312d4ec6cedfa50eda1f32f1.png

168 ms

arrow.png

arrow.png

780 ms

admin.png

admin.png

810 ms

__utm.gif

__utm.gif

20 ms

regstat_pro.aspx

regstat_pro.aspx

205 ms

addthis_widget.js

addthis_widget.js

12 ms

loading.gif

loading.gif

768 ms

close.png

close.png

927 ms

grin.gif

grin.gif

1363 ms

transdot.gif

transdot.gif

81 ms

wink.gif

wink.gif

1185 ms

scared.gif

scared.gif

1223 ms

cool.gif

cool.gif

1263 ms

sleep.gif

sleep.gif

1267 ms

blush.gif

blush.gif

1269 ms

unsure.gif

unsure.gif

1334 ms

shocked.gif

shocked.gif

1197 ms

Accessibility Review

zkkf.nl accessibility score

72

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.

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

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

Form elements do not have associated labels

High

Links do not have a discernible name

Best Practices

zkkf.nl best practices score

50

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

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

zkkf.nl SEO score

69

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

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 Zkkf.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 Zkkf.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

zkkf.nl

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