Tools & Wizards About Us
clustal.org screenshot

Report Summary

  • 97

    Performance

    Renders faster than
    95% of other websites

  • 86

    Accessibility

    Visual factors better than
    that of 62% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 77

    SEO

    Google-friendlier than
    36% of websites

clustal.org

Clustal Omega, ClustalW and ClustalX Multiple Sequence Alignment

Page Load Speed

1.5 sec in total

First Response

388 ms

Resources Loaded

988 ms

Page Rendered

125 ms

clustal.org screenshot

About Website

Click here to check amazing Clustal content for United States. Otherwise, check out these important facts you probably never knew about clustal.org

homepage of the clustal series of programs (clustal omega, clustalw and clustalx) for multiple sequence alignment

Visit clustal.org

Key Findings

We analyzed Clustal.org page load time and found that the first response time was 388 ms and then it took 1.1 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 20% of websites can load faster.

Performance Metrics

clustal.org performance score

97

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.0 s

100/100

10%

LCP (Largest Contentful Paint)

Value2.5 s

89/100

25%

SI (Speed Index)

Value1.1 s

100/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.029

100/100

15%

TTI (Time to Interactive)

Value1.0 s

100/100

10%

Network Requests Diagram

clustal.org

388 ms

stylesheet.css

100 ms

urchin.js

20 ms

__utm.gif

9 ms

ucd_brandmark_colour_small_50p_trans.png

197 ms

Our browser made a total of 8 requests to load all elements on the main page. We found that 75% of them (6 requests) were addressed to the original Clustal.org, 25% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (491 ms) belongs to the original domain Clustal.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 11.8 kB (7%)

Content Size

177.7 kB

After Optimization

166.0 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Clustal.org main page is 177.7 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 10% of websites need less resources to load. Images take 163.1 kB which makes up the majority of the site volume.

HTML Optimization

-65%

Potential reduce by 3.2 kB

  • Original 4.9 kB
  • After minification 4.2 kB
  • After compression 1.7 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 719 B, which is 15% 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 3.2 kB or 65% of the original size.

Image Optimization

-3%

Potential reduce by 5.3 kB

  • Original 163.1 kB
  • After minification 157.8 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. Clustal images are well optimized though.

JavaScript Optimization

-14%

Potential reduce by 971 B

  • Original 6.8 kB
  • After minification 6.8 kB
  • After compression 5.9 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 971 B or 14% of the original size.

CSS Optimization

-80%

Potential reduce by 2.3 kB

  • Original 2.9 kB
  • After minification 1.5 kB
  • After compression 565 B

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. Clustal.org needs all CSS files to be minified and compressed as it can save up to 2.3 kB or 80% 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 Clustal. According to our analytics all requests are already optimized.

Network Requests Diagram

clustal.org

clustal.org

388 ms

stylesheet.css

stylesheet.css

100 ms

urchin.js

urchin.js

20 ms

__utm.gif

__utm.gif

9 ms

ucd_brandmark_colour_small_50p_trans.png

ucd_brandmark_colour_small_50p_trans.png

197 ms

sfi_new.png

sfi_new.png

195 ms

clustalo_big.png

clustalo_big.png

430 ms

clustalw_big.png

clustalw_big.png

491 ms

Accessibility Review

clustal.org accessibility score

86

Accessibility Issues

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

Best Practices

clustal.org best practices score

75

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Serves images with low resolution

SEO Factors

clustal.org SEO score

77

Search Engine Optimization Advices

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Clustal.org can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Clustal.org main page’s claimed encoding is iso-8859-1. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

clustal.org

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