Tools & Wizards About Us
sep.nu screenshot

Report Summary

  • 20

    Performance

    Renders faster than
    37% of other websites

  • 78

    Accessibility

    Visual factors better than
    that of 45% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 92

    SEO

    Google-friendlier than
    74% of websites

sep.nu

SEP | Home - SEP: voor kunst en cultuur in het basis- en speciaal onderwijs in Amsterdam

Page Load Speed

11.9 sec in total

First Response

310 ms

Resources Loaded

8.9 sec

Page Rendered

2.7 sec

sep.nu screenshot

About Website

Visit sep.nu now to see the best up-to-date SEP content and also check out these interesting facts you probably never knew about sep.nu

SEP - Stichting Educatieve Projecten - biedt kunst- en cultuureducatie voor het basis- en speciaal onderwijs in Amsterdam.

Visit sep.nu

Key Findings

We analyzed Sep.nu page load time and found that the first response time was 310 ms and then it took 11.6 sec to load all DOM resources and completely render a web page. This is a poor result, as 90% of websites can load faster.

Performance Metrics

sep.nu performance score

20

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.9 s

25/100

10%

LCP (Largest Contentful Paint)

Value8.3 s

2/100

25%

SI (Speed Index)

Value8.5 s

17/100

10%

TBT (Total Blocking Time)

Value1,390 ms

16/100

30%

CLS (Cumulative Layout Shift)

Value0.16

73/100

15%

TTI (Time to Interactive)

Value34.8 s

0/100

10%

Network Requests Diagram

sep.nu

310 ms

sep.nu

1176 ms

style.css

190 ms

css

36 ms

jquery-3.3.1.min.js

391 ms

Our browser made a total of 163 requests to load all elements on the main page. We found that 97% of them (158 requests) were addressed to the original Sep.nu, 2% (3 requests) were made to Fonts.gstatic.com and 1% (1 request) were made to Fonts.googleapis.com. The less responsive or slowest element that took the longest time to load (3 sec) belongs to the original domain Sep.nu.

Page Optimization Overview & Recommendations

Page size can be reduced by 231.5 kB (2%)

Content Size

10.1 MB

After Optimization

9.8 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Sep.nu main page is 10.1 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. 70% of websites need less resources to load. Images take 9.7 MB which makes up the majority of the site volume.

HTML Optimization

-85%

Potential reduce by 135.0 kB

  • Original 158.8 kB
  • After minification 142.6 kB
  • After compression 23.8 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 135.0 kB or 85% of the original size.

Image Optimization

-1%

Potential reduce by 85.0 kB

  • Original 9.7 MB
  • After minification 9.7 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. SEP images are well optimized though.

JavaScript Optimization

-6%

Potential reduce by 7.5 kB

  • Original 131.9 kB
  • After minification 131.9 kB
  • After compression 124.4 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

-11%

Potential reduce by 4.0 kB

  • Original 36.4 kB
  • After minification 35.4 kB
  • After compression 32.3 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. Sep.nu needs all CSS files to be minified and compressed as it can save up to 4.0 kB or 11% of the original size.

Requests Breakdown

Number of requests can be reduced by 36 (23%)

Requests Now

158

After Optimization

122

  • Images
  • JavaScript
  • CSS

The browser has sent 158 CSS, Javascripts, AJAX and image requests in order to completely render the main page of SEP. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 19 to 1 for JavaScripts and from 12 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

sep.nu

sep.nu

310 ms

sep.nu

sep.nu

1176 ms

style.css

style.css

190 ms

css

css

36 ms

jquery-3.3.1.min.js

jquery-3.3.1.min.js

391 ms

owl.carousel.css

owl.carousel.css

285 ms

owl.theme.default.css

owl.theme.default.css

304 ms

owl.carousel.js

owl.carousel.js

402 ms

style.min.css

style.min.css

388 ms

styles.css

styles.css

293 ms

app.css

app.css

382 ms

style.css

style.css

401 ms

style.css

style.css

413 ms

jquery.min.js

jquery.min.js

579 ms

jquery-migrate.min.js

jquery-migrate.min.js

491 ms

index.js

index.js

405 ms

index.js

index.js

409 ms

api.js

api.js

45 ms

wp-polyfill-inert.min.js

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412 ms

regenerator-runtime.min.js

regenerator-runtime.min.js

420 ms

wp-polyfill.min.js

wp-polyfill.min.js

643 ms

index.js

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638 ms

main.js

main.js

639 ms

lib.core.js

lib.core.js

640 ms

lib.view.js

lib.view.js

643 ms

client.js

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641 ms

client.js

client.js

641 ms

tag.item.js

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641 ms

tag.ui.js

tag.ui.js

642 ms

handler.image.js

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709 ms

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sep-logo-home.svg

180 ms

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177 ms

beeld.svg

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295 ms

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298 ms

audiovisueel.svg

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296 ms

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300 ms

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301 ms

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303 ms

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304 ms

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306 ms

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461 ms

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701 ms

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723 ms

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630 ms

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546 ms

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649 ms

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820 ms

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931 ms

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891 ms

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1005 ms

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1016 ms

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1020 ms

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1385 ms

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1179 ms

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1034 ms

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1135 ms

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1132 ms

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52 ms

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53 ms

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186 ms

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1192 ms

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1411 ms

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1240 ms

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1311 ms

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1468 ms

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1604 ms

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1308 ms

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1657 ms

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1401 ms

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1865 ms

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1401 ms

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1344 ms

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1294 ms

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1509 ms

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1437 ms

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1412 ms

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1689 ms

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1824 ms

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1868 ms

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1530 ms

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1522 ms

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1679 ms

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2151 ms

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1776 ms

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1999 ms

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1809 ms

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1662 ms

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1950 ms

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2234 ms

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1863 ms

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1892 ms

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2035 ms

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2459 ms

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2363 ms

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1920 ms

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2401 ms

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2051 ms

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2107 ms

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2186 ms

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2424 ms

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2495 ms

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2421 ms

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2390 ms

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2293 ms

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2298 ms

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2635 ms

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2658 ms

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2437 ms

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2615 ms

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2589 ms

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2299 ms

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2603 ms

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2339 ms

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2794 ms

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2477 ms

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2352 ms

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2173 ms

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2972 ms

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2171 ms

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2419 ms

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2515 ms

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2412 ms

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2541 ms

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2517 ms

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2843 ms

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2285 ms

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2445 ms

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2147 ms

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2322 ms

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2710 ms

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2191 ms

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2039 ms

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2099 ms

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1970 ms

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1963 ms

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1988 ms

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1811 ms

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1790 ms

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1772 ms

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1709 ms

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1690 ms

Accessibility Review

sep.nu accessibility score

78

Accessibility Issues

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

Buttons do not have an accessible name

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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.

Best Practices

sep.nu 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

Low

Detected JavaScript libraries

SEO Factors

sep.nu SEO score

92

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Image elements do not have [alt] attributes

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

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    NL

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Sep.nu can be misinterpreted by Google and other search engines. Our service has detected that Dutch is used on the page, and it does not match the claimed English language. Our system also found out that Sep.nu 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

sep.nu

Open Graph data is detected on the main page of SEP. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: