Tools & Wizards About Us
vaccines.net screenshot

Report Summary

  • 68

    Performance

    Renders faster than
    80% of other websites

  • 56

    Accessibility

    Visual factors better than
    that of 23% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 77

    SEO

    Google-friendlier than
    36% of websites

vaccines.net

Page Load Speed

1.6 sec in total

First Response

455 ms

Resources Loaded

575 ms

Page Rendered

520 ms

vaccines.net screenshot

About Website

Visit vaccines.net now to see the best up-to-date Vaccines content and also check out these interesting facts you probably never knew about vaccines.net

Visit vaccines.net

Key Findings

We analyzed Vaccines.net page load time and found that the first response time was 455 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

vaccines.net performance score

68

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.7 s

61/100

10%

LCP (Largest Contentful Paint)

Value2.7 s

86/100

25%

SI (Speed Index)

Value4.6 s

70/100

10%

TBT (Total Blocking Time)

Value210 ms

89/100

30%

CLS (Cumulative Layout Shift)

Value0.613

10/100

15%

TTI (Time to Interactive)

Value7.4 s

48/100

10%

Network Requests Diagram

vaccines.net

455 ms

sumtextb.jpg

179 ms

newpage114.htm_cmp_sumipntg110_hbtn.gif

185 ms

newpage114.htm_cmp_sumipntg110_hbtn_a.gif

186 ms

newpage1.htm_cmp_sumipntg110_hbtn.gif

187 ms

Our browser made a total of 6 requests to load all elements on the main page. We found that all of those requests were addressed to Vaccines.net and no external sources were called. The less responsive or slowest element that took the longest time to load (455 ms) belongs to the original domain Vaccines.net.

Page Optimization Overview & Recommendations

Page size can be reduced by 2.8 kB (31%)

Content Size

9.1 kB

After Optimization

6.3 kB

  • HTML
  • Images

In fact, the total size of Vaccines.net main page is 9.1 kB. This result falls within a vast category (top 1 000 000) of heavyweight, probably not optimized, and thus slow loading web pages. Only a small number of websites need less resources to load. Images take 6.3 kB which makes up the majority of the site volume.

HTML Optimization

-69%

Potential reduce by 1.9 kB

  • Original 2.8 kB
  • After minification 2.6 kB
  • After compression 871 B

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 1.9 kB or 69% of the original size.

Image Optimization

-14%

Potential reduce by 909 B

  • Original 6.3 kB
  • After minification 5.4 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. Obviously, Vaccines needs image optimization as it can save up to 909 B or 14% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

Requests Breakdown

We found no issues to fix!

Requests Now

5

After Optimization

5

  • Images

The browser has sent 5 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Vaccines. According to our analytics all requests are already optimized.

Network Requests Diagram

vaccines.net

vaccines.net

455 ms

sumtextb.jpg

sumtextb.jpg

179 ms

newpage114.htm_cmp_sumipntg110_hbtn.gif

newpage114.htm_cmp_sumipntg110_hbtn.gif

185 ms

newpage114.htm_cmp_sumipntg110_hbtn_a.gif

newpage114.htm_cmp_sumipntg110_hbtn_a.gif

186 ms

newpage1.htm_cmp_sumipntg110_hbtn.gif

newpage1.htm_cmp_sumipntg110_hbtn.gif

187 ms

newpage1.htm_cmp_sumipntg110_hbtn_a.gif

newpage1.htm_cmp_sumipntg110_hbtn_a.gif

190 ms

Accessibility Review

vaccines.net accessibility score

56

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

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

vaccines.net best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

High

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

vaccines.net SEO score

77

Search Engine Optimization Advices

Crawling and Indexing

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

Impact

Issue

High

Links are not crawlable

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Image elements do not have [alt] attributes

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

Language and Encoding

  • Language Detected

    N/A

  • Language Claimed

    N/A

  • Encoding

    N/A

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Vaccines.net can be misinterpreted by Google and other search engines. Unfortunately we cannot identify language used on the page (probably there is a mix of languages, too little text or something else) and no language is claimed in <html> or <meta> tags either. Our system also found out that Vaccines.net main page’s claimed encoding is . 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

vaccines.net

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