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jazzhistorydatabase.org screenshot

Report Summary

  • 15

    Performance

    Renders faster than
    27% of other websites

  • 77

    Accessibility

    Visual factors better than
    that of 44% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 72

    SEO

    Google-friendlier than
    31% of websites

jazzhistorydatabase.org

Jazz History Database - Worldwide Historical Jazz Archives

Page Load Speed

5.1 sec in total

First Response

43 ms

Resources Loaded

3.5 sec

Page Rendered

1.6 sec

jazzhistorydatabase.org screenshot

About Website

Visit jazzhistorydatabase.org now to see the best up-to-date Jazz History Database content and also check out these interesting facts you probably never knew about jazzhistorydatabase.org

Jazz History Database - Thousands of digital media audio, video, transcriptions, interviews, and more. Free and Open to all. Digital Jazz Museum

Visit jazzhistorydatabase.org

Key Findings

We analyzed Jazzhistorydatabase.org page load time and found that the first response time was 43 ms and then it took 5.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Performance Metrics

jazzhistorydatabase.org performance score

15

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value6.1 s

3/100

10%

LCP (Largest Contentful Paint)

Value14.2 s

0/100

25%

SI (Speed Index)

Value20.0 s

0/100

10%

TBT (Total Blocking Time)

Value28,800 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value54.3 s

0/100

10%

Network Requests Diagram

jazzhistorydatabase.org

43 ms

jazzhistorydatabase.com

24 ms

jazzhistorydatabase.com

102 ms

www.jazzhistorydatabase.com

115 ms

index.php

36 ms

Our browser made a total of 118 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Jazzhistorydatabase.org, 62% (73 requests) were made to Jazzhistorydatabase.com and 9% (11 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (2 sec) relates to the external source Jazzhistorydatabase.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 624.8 kB (10%)

Content Size

6.1 MB

After Optimization

5.5 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Jazzhistorydatabase.org main page is 6.1 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. Only a small number of websites need less resources to load. Images take 5.2 MB which makes up the majority of the site volume.

HTML Optimization

-90%

Potential reduce by 106.3 kB

  • Original 117.9 kB
  • After minification 52.8 kB
  • After compression 11.7 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 65.1 kB, which is 55% 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 106.3 kB or 90% of the original size.

Image Optimization

-5%

Potential reduce by 280.0 kB

  • Original 5.2 MB
  • After minification 4.9 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. Jazz History Database images are well optimized though.

JavaScript Optimization

-36%

Potential reduce by 227.1 kB

  • Original 622.3 kB
  • After minification 622.3 kB
  • After compression 395.3 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 227.1 kB or 36% of the original size.

CSS Optimization

-7%

Potential reduce by 11.4 kB

  • Original 174.0 kB
  • After minification 174.0 kB
  • After compression 162.6 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. Jazzhistorydatabase.org has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 31 (32%)

Requests Now

96

After Optimization

65

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 96 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Jazz History Database. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 21 to 1 for JavaScripts and from 12 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

jazzhistorydatabase.org

jazzhistorydatabase.org

43 ms

jazzhistorydatabase.com

jazzhistorydatabase.com

24 ms

jazzhistorydatabase.com

jazzhistorydatabase.com

102 ms

www.jazzhistorydatabase.com

www.jazzhistorydatabase.com

115 ms

index.php

index.php

36 ms

index.php

index.php

154 ms

css

css

47 ms

bootstrap.css

bootstrap.css

128 ms

style.css

style.css

96 ms

dark.css

dark.css

114 ms

font-icons.css

font-icons.css

119 ms

animate.css

animate.css

138 ms

magnific-popup.css

magnific-popup.css

141 ms

responsive.css

responsive.css

178 ms

JHDB.css

JHDB.css

186 ms

audioplayer.css

audioplayer.css

187 ms

js

js

72 ms

email-decode.min.js

email-decode.min.js

112 ms

jquery.js

jquery.js

335 ms

plugins.js

plugins.js

338 ms

audioplayer.js

audioplayer.js

336 ms

functions.js

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364 ms

legal.js

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333 ms

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335 ms

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515 ms

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515 ms

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487 ms

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270 ms

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270 ms

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286 ms

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276 ms

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286 ms

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1644 ms

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225 ms

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267 ms

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307 ms

font-icons.woff

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1693 ms

1Ptxg8zYS_SKggPN4iEgvnHyvveLxVsEpbCIPrc.woff

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365 ms

1Ptxg8zYS_SKggPN4iEgvnHyvveLxVs9pbCIPrc.woff

1Ptxg8zYS_SKggPN4iEgvnHyvveLxVs9pbCIPrc.woff

364 ms

1Ptxg8zYS_SKggPN4iEgvnHyvveLxVvoorCIPrc.woff

1Ptxg8zYS_SKggPN4iEgvnHyvveLxVvoorCIPrc.woff

364 ms

1Ptxg8zYS_SKggPN4iEgvnHyvveLxVvaorCIPrc.woff

1Ptxg8zYS_SKggPN4iEgvnHyvveLxVvaorCIPrc.woff

366 ms

1Ptxg8zYS_SKggPN4iEgvnHyvveLxVuEorCIPrc.woff

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363 ms

S6u8w4BMUTPHjxsAXC-s.woff

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364 ms

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2006 ms

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1942 ms

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29 ms

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31 ms

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75 ms

base.js

base.js

274 ms

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1925 ms

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1920 ms

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1916 ms

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1913 ms

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1914 ms

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1913 ms

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647 ms

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996 ms

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1040 ms

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1728 ms

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821 ms

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644 ms

embed.js

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438 ms

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1121 ms

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preloader.gif

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id

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178 ms

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293 ms

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675 ms

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127 ms

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128 ms

Create

Create

502 ms

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505 ms

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507 ms

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508 ms

Create

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597 ms

404.php

404.php

82 ms

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164 ms

Accessibility Review

jazzhistorydatabase.org accessibility score

77

Accessibility Issues

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

High

[aria-hidden="true"] elements contain focusable descendents

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

<frame> or <iframe> elements do not have a title

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Best Practices

jazzhistorydatabase.org best practices score

67

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

SEO Factors

jazzhistorydatabase.org SEO score

72

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

Links do not have descriptive text

High

Image elements do not have [alt] attributes

Crawling and Indexing

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

Impact

Issue

High

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

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    EN

  • Encoding

    UTF-8

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

jazzhistorydatabase.org

Open Graph description is not detected on the main page of Jazz History Database. 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: