Analyze Zonvakantie - Sunweb Zonvakanties

Zonvakanties boek je bij Sunweb: vind de mooiste vakanties naar Griekenland, Spanje, Turkije, Portugal, Egypte, Malta, Kroatië en nog veel meer!

Page load speed analysis

  • 61/100

    Normal result
  • 7

    Successful tests
  • 1

    Failed test
  • First response

    351 ms

  • Resources loaded

    4.9 sec

  • Page rendered

    853 ms

  • Total page load time

    6.1 sec

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We analyzed page load time and found that the first response time was 351 ms and then it took 5.8 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Page optimization

  • HTML 329.5 kB
    Images 715.1 kB
    Javascripts 185.7 kB
    CSS 0 B

    In fact, the total size of 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. 55% of websites need less resources to load. Images take 715.1 kB which makes up the majority of the site volume.

    • Original 329.5 kB
    • After minification 319.0 kB
    • After compression 47.1 kB

    HTML optimization

    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 282.4 kB or 86% of the original size.

    • Original 715.1 kB
    • After optimization 689.6 kB

    Image optimization

    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. Ferio images are well optimized though.

    • Original 185.7 kB
    • After minification 184.0 kB
    • After compression 64.5 kB

    JavaScript optimization

    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 121.2 kB or 65% of the original size.

Network requests diagram

  • p13n.sundio.min.js
  • css
  • advertising.js
  • defer
  • defer
  • js
  • js
  • show_sgr.png
  • logo-sunweb.png
  • sponsors.png
  • 20151217_popup.jpg
  • show_anvr.png
  • show_homeshopping.png
  • show_calamityfunds.png
  • payment_logos-sprite-NL.png
  • ajax-loader-02.gif
  • footer-badge.png
  • css
  • j.php
  • header-lines.png
  • arrow-down-hand-small.svg
  • slider_family_nl-xxl.jpg
  • catalog
  • home-selections.gif
  • idealedeals-logo.png
  • icon-sprite.png
  • slider_158-xxl.jpg
  • wave.png
  • home-lastminutes.jpg
  • urgent-messages26-xxl.jpg
  • urgent-messages29-xxl.jpg
  • slider_192-xxl.jpg
  • slider_165-xxl.jpg
  • footer.png
  • brandpromise_01.gif
  • sansapro-semibold-webfont.woff
  • sansapro-bold-webfont.woff
  • sunweb-icons.woff
  • pacifico-webfont.woff
  • p13n_generated.js
  • v.gif
  • icon-sprite.png
  • home-topdestinations.jpg
  • dc.js
  • gtm.js
  • ajax-loader.gif
  • icon-input.png
  • ControlLoader.ashx
  • check.gif
  • getaccommodationsearchdatamodel
  • getaccommodationsearchdatamodel
  • optin.js
  • optout.js
  • wood-pattern.jpg
  • flags-32px.png
  • optiextension.dll
  • __utm.gif
  • conversion_async.js
  • fbds.js
  • bat.js
  • view.php
  • __utm.gif
  • __utm.gif
  • __utm.gif
  • getimage.ashx
  • getimage.ashx
  • getimage.ashx
  • getimage.ashx
  • getimage.ashx
  • getimage.ashx
  • getimage.ashx
  • getimage.ashx
  • getimage.ashx
  • getimage.ashx
  • getimage.ashx
  • getimage.ashx
  • getimage.ashx
  • 9uu.js
  • trip-plane-acco-transfer.png
  • selections_s.png

Our browser made a total of 87 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original, 30% (26 requests) were made to and 20% (17 requests) were made to The less responsive or slowest element that took the longest time to load (925 ms) relates to the external source

Additional info on


The browser has sent 79 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Ferio. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 16 to 1 for JavaScripts and as a result speed up the page load time.











Possible request optimization













Normal result


As for redirects, our browser was forwarded to before it reached this domain.

IP address

This IP address is dedicated to This is the best domain hosting practice .

Good result

IP Trace

DNS records

Type Host Target/ip TTL Other
NS 300
NS 300

300 Mname:
Serial: 2017101900
Refresh: 28800
Retry: 7200
Expire: 1209600
Minimum-ttl: 3600

300 Txt: TikzCdueGOF2XzdsUU26LrRN8jf1yhoLdU0GNr8QP8CR5XZrjsSmBN6FvLuaFas57Qq1q+xAt9RjgY52GaPBqA==

300 Txt: v=spf1 a mx ip4: ip4: ip4: ip4: ip4: ip4: ip4: -all

Language and encoding

Good result


NL nl language flag


NL nl language flag





Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise 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 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.

HTTPS certificate

SSL Certificate has no SSL certificate. Web browsing can be safer with HTTPS connection, so we suggest that it should be obtained for this site.

Normal result

Visitor World Map

Unfortunately, we cannot identify the countries where the visitors come from and thus it’s impossible to define if the distance can potentially affect the page load time.

Good result

Poor result

Social Sharing Optimization

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

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