2.8 sec in total
357 ms
2.2 sec
223 ms
Click here to check amazing Koster content. Otherwise, check out these important facts you probably never knew about koster.nl
KOSTER verzekeringen uit Alphen aan den Rijn geeft onafhankelijk advies over verzekeringen en pensioenen aan bedrijven, organisaties en particulieren.
Visit koster.nlWe analyzed Koster.nl page load time and found that the first response time was 357 ms and then it took 2.4 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 45% of websites can load faster.
koster.nl performance score
name
value
score
weighting
Value0.8 s
100/100
10%
Value8.1 s
2/100
25%
Value4.9 s
65/100
10%
Value1,310 ms
18/100
30%
Value0.004
100/100
15%
Value7.4 s
48/100
10%
357 ms
431 ms
264 ms
180 ms
176 ms
Our browser made a total of 38 requests to load all elements on the main page. We found that 95% of them (36 requests) were addressed to the original Koster.nl, 3% (1 request) were made to Google-analytics.com and 3% (1 request) were made to Stats.g.doubleclick.net. The less responsive or slowest element that took the longest time to load (819 ms) belongs to the original domain Koster.nl.
Page size can be reduced by 100.9 kB (18%)
559.5 kB
458.6 kB
In fact, the total size of Koster.nl main page is 559.5 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 405.3 kB which makes up the majority of the site volume.
Potential reduce by 14.5 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 14.5 kB or 76% of the original size.
Potential reduce by 6.0 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. Koster images are well optimized though.
Potential reduce by 61.9 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 61.9 kB or 55% of the original size.
Potential reduce by 18.5 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. Koster.nl needs all CSS files to be minified and compressed as it can save up to 18.5 kB or 84% of the original size.
Number of requests can be reduced by 18 (60%)
30
12
The browser has sent 30 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Koster. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 4 to 1 for JavaScripts and from 6 to 1 for CSS and as a result speed up the page load time.
koster.nl
357 ms
www.koster.nl
431 ms
showdoc.asp
264 ms
dropdown.css
180 ms
default-dropdown.css
176 ms
thumbnail.css
165 ms
menu_extranet.css
173 ms
basis.css
272 ms
jquery-1.9.0.min.js
453 ms
sss.min.js
260 ms
sss.css
252 ms
util.js
202 ms
ga.js
7 ms
koster_home.png
176 ms
socialm_t_28_1.png
123 ms
socialm_f_28_1.png
142 ms
socialm_l_28_1.png
141 ms
socialm_g_28_1.png
141 ms
socialm_y_28_1.png
141 ms
socialm_eng_28_1.png
183 ms
loep.png
210 ms
panorama_brug_1.jpg
796 ms
carousel_pensioenregeling.jpg
819 ms
carousel_verzuim.jpg
477 ms
carousel_pakket.jpg
361 ms
carousel_expiratie.jpg
415 ms
carousel_cybercrime.jpg
441 ms
pix.png
288 ms
icon_login.png
369 ms
icon_contact.png
441 ms
icon_schade.png
450 ms
OpenSans-Regular-webfont.woff
510 ms
OpenSans-Semibold-webfont.woff
525 ms
OpenSans-Light-webfont.woff
528 ms
OpenSans-Bold-webfont.woff
617 ms
OpenSans-ExtraBold-webfont.woff
624 ms
arr.png
495 ms
collect
67 ms
koster.nl accessibility score
ARIA
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
Impact
Issue
[aria-hidden="true"] elements contain focusable descendents
koster.nl best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
General
Impact
Issue
Detected JavaScript libraries
Browser errors were logged to the console
koster.nl SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
Links are not crawlable
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
Document uses legible font sizes
Tap targets are not sized appropriately
N/A
N/A
ISO-8859-1
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Koster.nl can be misinterpreted by Google and other search engines. Unfortunately we cannot identify language used on the page (probably there is a mix of languages, too little text or something else) and no language is claimed in <html> or <meta> tags either. Our system also found out that Koster.nl main page’s claimed encoding is iso-8859-1. 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.
koster.nl
Open Graph description is not detected on the main page of Koster. 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: