Tools & Wizards About Us
karolinska.se screenshot

Report Summary

  • 91

    Performance

    Renders faster than
    91% of other websites

  • 100

    Accessibility

    Visual factors better than
    that of 97% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 100

    SEO

    Google-friendlier than
    94% of websites

karolinska.se

Karolinska Institutet & Karolinska Universitetssjukhuset, ledande inom vård, forskning, utbildning

Page Load Speed

2.4 sec in total

First Response

259 ms

Resources Loaded

1.9 sec

Page Rendered

194 ms

karolinska.se screenshot

About Website

Click here to check amazing Karolinska content for Sweden. Otherwise, check out these important facts you probably never knew about karolinska.se

Besök Karolinska Institutet & Karolinska Universitetssjukhuset, ledande inom vård, forskning, utbildning

Visit karolinska.se

Key Findings

We analyzed Karolinska.se page load time and found that the first response time was 259 ms and then it took 2.1 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 40% of websites can load faster.

Performance Metrics

karolinska.se performance score

91

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.1 s

80/100

10%

LCP (Largest Contentful Paint)

Value3.1 s

76/100

25%

SI (Speed Index)

Value2.7 s

96/100

10%

TBT (Total Blocking Time)

Value20 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.008

100/100

15%

TTI (Time to Interactive)

Value3.1 s

95/100

10%

Network Requests Diagram

www.karolinska.se

259 ms

www.karolinska.se

201 ms

val-av-webbplats

168 ms

split-page.css

24 ms

split-page.js

59 ms

Our browser made a total of 11 requests to load all elements on the main page. We found that 91% of them (10 requests) were addressed to the original Karolinska.se, 9% (1 request) were made to Az416426.vo.msecnd.net. The less responsive or slowest element that took the longest time to load (923 ms) belongs to the original domain Karolinska.se.

Page Optimization Overview & Recommendations

Page size can be reduced by 238.9 kB (83%)

Content Size

286.2 kB

After Optimization

47.4 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Karolinska.se main page is 286.2 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. Only 5% of websites need less resources to load. Images take 253.7 kB which makes up the majority of the site volume.

HTML Optimization

-74%

Potential reduce by 5.8 kB

  • Original 7.8 kB
  • After minification 6.1 kB
  • After compression 2.1 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 1.7 kB, which is 22% 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 5.8 kB or 74% of the original size.

Image Optimization

-92%

Potential reduce by 232.3 kB

  • Original 253.7 kB
  • After minification 21.4 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. Obviously, Karolinska needs image optimization as it can save up to 232.3 kB or 92% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-1%

Potential reduce by 119 B

  • Original 22.9 kB
  • After minification 22.9 kB
  • After compression 22.8 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. This website has mostly compressed JavaScripts.

CSS Optimization

-39%

Potential reduce by 696 B

  • Original 1.8 kB
  • After minification 1.8 kB
  • After compression 1.1 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. Karolinska.se needs all CSS files to be minified and compressed as it can save up to 696 B or 39% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

7

After Optimization

7

  • Images
  • JavaScript
  • CSS

The browser has sent 7 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Karolinska. According to our analytics all requests are already optimized.

Network Requests Diagram

www.karolinska.se

www.karolinska.se

259 ms

www.karolinska.se

www.karolinska.se

201 ms

val-av-webbplats

val-av-webbplats

168 ms

split-page.css

split-page.css

24 ms

split-page.js

split-page.js

59 ms

ks_se.png

ks_se.png

161 ms

ks_en.png

ks_en.png

183 ms

KI_digital_logotyp_negativ_RGB_new.png

KI_digital_logotyp_negativ_RGB_new.png

923 ms

change-language.svg

change-language.svg

55 ms

ai.0.js

ai.0.js

18 ms

opensans-light-webfont.woff

opensans-light-webfont.woff

137 ms

Accessibility Review

karolinska.se accessibility score

100

Accessibility Issues

Best Practices

karolinska.se best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

High

Page has valid source maps

SEO Factors

karolinska.se SEO score

100

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

Document uses legible font sizes

Language and Encoding

  • Language Detected

    SV

  • Language Claimed

    SV

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Karolinska.se can be misinterpreted by Google and other search engines. Our service has detected that Swedish is used on the page, and it matches the claimed language. Our system also found out that Karolinska.se 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

karolinska.se

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