Tools & Wizards About Us

Report Summary

  • 14

    Performance

    Renders faster than
    26% of other websites

  • 78

    Accessibility

    Visual factors better than
    that of 45% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 93

    SEO

    Google-friendlier than
    83% of websites

nhm.org

Natural History Museum

Page Load Speed

1.3 sec in total

First Response

30 ms

Resources Loaded

597 ms

Page Rendered

694 ms

About Website

Visit nhm.org now to see the best up-to-date Nhm content for China and also check out these interesting facts you probably never knew about nhm.org

Discover the wonders of our natural and cultural worlds through captivating exhibits like our renowned Dino Hall, ancient artifacts, blooming nature gardens, interactive learning labs, and more. Get n...

Visit nhm.org

Key Findings

We analyzed Nhm.org page load time and found that the first response time was 30 ms and then it took 1.3 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 25% of websites can load faster.

Performance Metrics

nhm.org performance score

14

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.2 s

19/100

10%

LCP (Largest Contentful Paint)

Value16.3 s

0/100

25%

SI (Speed Index)

Value5.6 s

53/100

10%

TBT (Total Blocking Time)

Value2,200 ms

6/100

30%

CLS (Cumulative Layout Shift)

Value0.35

31/100

15%

TTI (Time to Interactive)

Value16.2 s

6/100

10%

Network Requests Diagram

nhm.org

30 ms

css_VdAYjN08MocT-EwqgMyZSZqz-iiI3q8hVtyBo891xv0.css

13 ms

style.css

28 ms

css_XiR-finKN-8ES_IOPYW2Tz0oUs3o4U4Ntp4515PG-ko.css

27 ms

css_7btZkwy5kjWeBKl3-2aDbhacO_S0nyOm9zCpk3ltfVg.css

42 ms

Our browser made a total of 24 requests to load all elements on the main page. We found that 67% of them (16 requests) were addressed to the original Nhm.org, 4% (1 request) were made to Googletagmanager.com and 4% (1 request) were made to Script.crazyegg.com. The less responsive or slowest element that took the longest time to load (225 ms) relates to the external source Cdn.jsdelivr.net.

Page Optimization Overview & Recommendations

Page size can be reduced by 238.2 kB (43%)

Content Size

555.5 kB

After Optimization

317.3 kB

  • HTML
  • JavaScript
  • CSS

In fact, the total size of Nhm.org main page is 555.5 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. 35% of websites need less resources to load. Javascripts take 200.8 kB which makes up the majority of the site volume.

HTML Optimization

-85%

Potential reduce by 144.3 kB

  • Original 170.1 kB
  • After minification 142.7 kB
  • After compression 25.8 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 27.4 kB, which is 16% 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 144.3 kB or 85% of the original size.

JavaScript Optimization

-21%

Potential reduce by 41.3 kB

  • Original 200.8 kB
  • After minification 200.8 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 41.3 kB or 21% of the original size.

CSS Optimization

-28%

Potential reduce by 52.6 kB

  • Original 184.5 kB
  • After minification 184.5 kB
  • After compression 132.0 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. Nhm.org needs all CSS files to be minified and compressed as it can save up to 52.6 kB or 28% of the original size.

Requests Breakdown

Number of requests can be reduced by 12 (75%)

Requests Now

16

After Optimization

4

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 16 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Nhm. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 10 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

nhm.org accessibility score

78

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

Elements with an ARIA [role] that require children to contain a specific [role] are missing some or all of those required children.

High

ARIA IDs are not unique

Best Practices

nhm.org 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

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

nhm.org SEO score

93

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

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

    EN

  • Language Claimed

    EN

  • Encoding

    UTF-8

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

Social Sharing Optimization

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