Tools & Wizards About Us

Report Summary

  • 78

    Performance

    Renders faster than
    85% of other websites

  • 69

    Accessibility

    Visual factors better than
    that of 34% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 78

    SEO

    Google-friendlier than
    39% of websites

bristoldynamics.com

Laser Chemistry, Spectroscopy & Dynamics Group | University of Bristol

Page Load Speed

6.3 sec in total

First Response

1.8 sec

Resources Loaded

4.3 sec

Page Rendered

160 ms

About Website

Visit bristoldynamics.com now to see the best up-to-date Bristol Dynamics content and also check out these interesting facts you probably never knew about bristoldynamics.com

Our research is concerned with the application of laser-based techniques in chemistry and materials science.

Visit bristoldynamics.com

Key Findings

We analyzed Bristoldynamics.com page load time and found that the first response time was 1.8 sec and then it took 4.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.

Performance Metrics

bristoldynamics.com performance score

78

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.3 s

41/100

10%

LCP (Largest Contentful Paint)

Value3.4 s

66/100

25%

SI (Speed Index)

Value4.4 s

74/100

10%

TBT (Total Blocking Time)

Value190 ms

90/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value5.1 s

75/100

10%

Network Requests Diagram

bristoldynamics.com

1821 ms

analytics.js

22 ms

style.min.css

401 ms

shortcodes.css

325 ms

style.css

327 ms

Our browser made a total of 39 requests to load all elements on the main page. We found that 77% of them (30 requests) were addressed to the original Bristoldynamics.com, 8% (3 requests) were made to Google-analytics.com and 8% (3 requests) were made to Use.typekit.net. The less responsive or slowest element that took the longest time to load (1.8 sec) belongs to the original domain Bristoldynamics.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 72.5 kB (16%)

Content Size

464.1 kB

After Optimization

391.5 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Bristoldynamics.com main page is 464.1 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. 30% of websites need less resources to load. Images take 204.8 kB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 35.2 kB

  • Original 45.9 kB
  • After minification 44.4 kB
  • After compression 10.7 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 35.2 kB or 77% of the original size.

Image Optimization

-6%

Potential reduce by 11.8 kB

  • Original 204.8 kB
  • After minification 193.0 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. Bristol Dynamics images are well optimized though.

JavaScript Optimization

-7%

Potential reduce by 12.4 kB

  • Original 171.8 kB
  • After minification 171.8 kB
  • After compression 159.5 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

-32%

Potential reduce by 13.2 kB

  • Original 41.5 kB
  • After minification 41.5 kB
  • After compression 28.4 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. Bristoldynamics.com needs all CSS files to be minified and compressed as it can save up to 13.2 kB or 32% of the original size.

Requests Breakdown

Number of requests can be reduced by 18 (50%)

Requests Now

36

After Optimization

18

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 36 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Bristol Dynamics. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 14 to 1 for JavaScripts and from 6 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

bristoldynamics.com accessibility score

69

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-*] attributes do not match their roles

High

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

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

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

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

bristoldynamics.com 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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

bristoldynamics.com SEO score

78

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

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Bristoldynamics.com 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 Bristoldynamics.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

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