Tools & Wizards About Us
vir.bio screenshot

Report Summary

  • 65

    Performance

    Renders faster than
    78% of other websites

  • 97

    Accessibility

    Visual factors better than
    that of 92% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 96

    SEO

    Google-friendlier than
    90% of websites

vir.bio

Vir Biotechnology | Powering the Immune System to Transform Lives

Page Load Speed

1.5 sec in total

First Response

38 ms

Resources Loaded

735 ms

Page Rendered

755 ms

vir.bio screenshot

About Website

Visit vir.bio now to see the best up-to-date Vir content for United States and also check out these interesting facts you probably never knew about vir.bio

Vir is leveraging immunologic breakthroughs to address unmet patient needs in infectious disease and beyond.

Visit vir.bio

Key Findings

We analyzed Vir.bio page load time and found that the first response time was 38 ms and then it took 1.5 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 30% of websites can load faster.

Performance Metrics

vir.bio performance score

65

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.5 s

36/100

10%

LCP (Largest Contentful Paint)

Value7.2 s

5/100

25%

SI (Speed Index)

Value4.0 s

81/100

10%

TBT (Total Blocking Time)

Value60 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.028

100/100

15%

TTI (Time to Interactive)

Value5.6 s

70/100

10%

Network Requests Diagram

vir.bio

38 ms

www.vir.bio

187 ms

OtAutoBlock.js

52 ms

otSDKStub.js

63 ms

main.css

79 ms

Our browser made a total of 26 requests to load all elements on the main page. We found that 42% of them (11 requests) were addressed to the original Vir.bio, 31% (8 requests) were made to Use.typekit.net and 12% (3 requests) were made to Cdn.cookielaw.org. The less responsive or slowest element that took the longest time to load (228 ms) belongs to the original domain Vir.bio.

Page Optimization Overview & Recommendations

Page size can be reduced by 16.7 kB (3%)

Content Size

505.2 kB

After Optimization

488.6 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Vir.bio main page is 505.2 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. 40% of websites need less resources to load. Images take 401.3 kB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 16.0 kB

  • Original 20.3 kB
  • After minification 19.7 kB
  • After compression 4.3 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 16.0 kB or 79% of the original size.

Image Optimization

-0%

Potential reduce by 524 B

  • Original 401.3 kB
  • After minification 400.7 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. Vir images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 68 B

  • Original 54.5 kB
  • After minification 54.5 kB
  • After compression 54.4 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

-0%

Potential reduce by 76 B

  • Original 29.2 kB
  • After minification 29.2 kB
  • After compression 29.2 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. Vir.bio has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 6 (35%)

Requests Now

17

After Optimization

11

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 17 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Vir. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 7 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

vir.bio

vir.bio

38 ms

www.vir.bio

www.vir.bio

187 ms

OtAutoBlock.js

OtAutoBlock.js

52 ms

otSDKStub.js

otSDKStub.js

63 ms

main.css

main.css

79 ms

jquery.min.js

jquery.min.js

31 ms

head.js

head.js

111 ms

js

js

90 ms

main.js

main.js

109 ms

5518af91-8663-4532-b28c-5ee0e46c83a4.json

5518af91-8663-4532-b28c-5ee0e46c83a4.json

26 ms

etf6wkw.css

etf6wkw.css

95 ms

location

location

52 ms

p.css

p.css

57 ms

logo.png

logo.png

98 ms

home-hero.jpg

home-hero.jpg

228 ms

home-hero.svg

home-hero.svg

92 ms

banner_careers2.jpg

banner_careers2.jpg

228 ms

banner_careers2.svg

banner_careers2.svg

97 ms

logo_white.png

logo_white.png

180 ms

d

d

60 ms

d

d

86 ms

d

d

92 ms

d

d

92 ms

d

d

93 ms

d

d

132 ms

d

d

92 ms

Accessibility Review

vir.bio accessibility score

97

Accessibility Issues

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

vir.bio best practices score

83

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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

vir.bio SEO score

96

Search Engine Optimization Advices

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 Vir.bio 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 Vir.bio 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

vir.bio

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