6.8 sec in total
256 ms
4.1 sec
2.5 sec
Visit zsl.org now to see the best up-to-date ZSL content for United Kingdom and also check out these interesting facts you probably never knew about zsl.org
We're ZSL - an international conservation charity driven by science, working to restore wildlife in the UK and around the world. Become a supporter today.
Visit zsl.orgWe analyzed Zsl.org page load time and found that the first response time was 256 ms and then it took 6.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 80% of websites can load faster.
zsl.org performance score
name
value
score
weighting
Value3.7 s
30/100
10%
Value16.6 s
0/100
25%
Value7.4 s
27/100
10%
Value2,660 ms
4/100
30%
Value0.009
100/100
15%
Value16.7 s
5/100
10%
256 ms
89 ms
29 ms
90 ms
88 ms
Our browser made a total of 145 requests to load all elements on the main page. We found that 55% of them (80 requests) were addressed to the original Zsl.org, 6% (8 requests) were made to Facebook.com and 5% (7 requests) were made to Apis.google.com. The less responsive or slowest element that took the longest time to load (1.5 sec) relates to the external source Dwin1.com.
Page size can be reduced by 1.3 MB (38%)
3.5 MB
2.2 MB
In fact, the total size of Zsl.org main page is 3.5 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. 80% 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 1.7 MB which makes up the majority of the site volume.
Potential reduce by 186.7 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. 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 186.7 kB or 80% of the original size.
Potential reduce by 24.4 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. ZSL images are well optimized though.
Potential reduce by 508.3 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 508.3 kB or 57% of the original size.
Potential reduce by 595.5 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. Zsl.org needs all CSS files to be minified and compressed as it can save up to 595.5 kB or 91% of the original size.
Number of requests can be reduced by 63 (44%)
142
79
The browser has sent 142 CSS, Javascripts, AJAX and image requests in order to completely render the main page of ZSL. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 35 to 1 for JavaScripts and from 8 to 1 for CSS and as a result speed up the page load time.
zsl.org
256 ms
www.zsl.org
89 ms
css__lKVY03o8tktAw6iNVgtrDLmYXsVTCoLn0OY1-gznQM8__diDfyh9suU0fqpFE1nAHIVtauH0Z2s8HPFpsD9c-0GU__NQ7krdKvH1O536Fu_TGR2zx9iq7t92D5sn2TdZUIROA.css
29 ms
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88 ms
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plusone.js
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jquery.mousewheel.min.js
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zsl.org accessibility score
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
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
Form elements do not have associated labels
Links do not have a discernible name
Best practices
These items highlight common accessibility best practices.
Impact
Issue
[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.
zsl.org best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks
General
Impact
Issue
Detected JavaScript libraries
zsl.org 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
EN
EN
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Zsl.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 Zsl.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.
zsl.org
Open Graph description is not detected on the main page of ZSL. 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: