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Report Summary

About Website

Welcome to northseajazz.com homepage info - get ready to check North Sea Jazz best content for Netherlands right away, or after learning these important things about northseajazz.com

11•12•13 JULI 2025 Rotterdam Ahoy. Het festival waar in drie dagen het verleden, heden én de toekomst van de jazz langskomen. Door de veelheid aan muzikale stijlen die worden gespeeld, vindt iedereen ...

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name

value

score

weighting

FCP (First Contentful Paint)

Value5.7 s

5/100

10%

LCP (Largest Contentful Paint)

Value25.1 s

0/100

25%

SI (Speed Index)

Value22.4 s

0/100

10%

TBT (Total Blocking Time)

Value4,870 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.034

100/100

15%

TTI (Time to Interactive)

Value37.8 s

0/100

10%

northseajazz.com

187 ms

1038 ms

rotterdam.css

354 ms

rotterdam.css

126 ms

logo_white_2023.svg

175 ms

Our browser made a total of 62 requests to load all elements on the main page. We found that 90% of them (56 requests) were addressed to the original Northseajazz.com, 5% (3 requests) were made to Cdn.cookielaw.org and 2% (1 request) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (2.8 sec) belongs to the original domain Northseajazz.com.

Content Size

8.3 MB

After Optimization

6.6 MB

In fact, the total size of Northseajazz.com main page is 8.3 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. 75% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 6.1 MB which makes up the majority of the site volume.

HTML Optimization

-95%

Potential reduce by 293.0 kB

Original 307.8 kB
After minification 121.7 kB
After compression 14.8 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. This page needs HTML code to be minified as it can gain 186.1 kB, which is 60% 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 293.0 kB or 95% of the original size.

Image Optimization

-2%

Potential reduce by 107.7 kB

Original 6.1 MB
After minification 6.0 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. North Sea Jazz images are well optimized though.

JavaScript Optimization

-67%

Potential reduce by 1.0 MB

Original 1.6 MB
After minification 1.6 MB
After compression 510.9 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 1.0 MB or 67% of the original size.

CSS Optimization

-81%

Potential reduce by 260.4 kB

Original 321.5 kB
After minification 321.3 kB
After compression 61.0 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. Northseajazz.com needs all CSS files to be minified and compressed as it can save up to 260.4 kB or 81% of the original size.

Requests Now

After Optimization

The browser has sent 51 CSS, Javascripts, AJAX and image requests in order to completely render the main page of North Sea Jazz. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 6 to 1 for JavaScripts and as a result speed up the page load time.

Accessibility Issues

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.

High

Buttons do not have an accessible name

High

Links do not have a discernible name

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

Search Engine Optimization Advices

To appear in search results, crawlers need access to your app.

High

Links are not crawlable

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/).

High

Document uses legible font sizes

Language and Encoding

Language Detected

EN
Language Claimed

NL
Encoding

UTF-8

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

northseajazz.com

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

Report Summary

Performance

Accessibility

Best Practices

SEO

Line-up, nieuws en tickets | NN North Sea Jazz Festival

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

northseajazz.com

rotterdam.css

rotterdam.css

logo_white_2023.svg

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

northseajazz.com

rotterdam.css

rotterdam.css

logo_white_2023.svg

logo_black_2023.svg

logo-detailed_white.svg

logo-detailed_black.svg

gtm.js

ABCMonumentGrotesk-Heavy.woff

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ABCMonumentGrotesk-Black.woff

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ABCMonumentGrotesk-Medium.woff

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