Report Summary

  • 31

    Performance

    Renders faster than
    51% of other websites

  • 97

    Accessibility

    Visual factors better than
    that of 91% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 93

    SEO

    Google-friendlier than
    83% of websites

nationalgallery.org.uk

The National Gallery, London

Page Load Speed

5 sec in total

First Response

244 ms

Resources Loaded

3.7 sec

Page Rendered

1.1 sec

nationalgallery.org.uk screenshot

About Website

Welcome to nationalgallery.org.uk homepage info - get ready to check National Gallery best content for United Kingdom right away, or after learning these important things about nationalgallery.org.uk

The Nation's Gallery. The story of European art, masterpiece by masterpiece.

Visit nationalgallery.org.uk

Key Findings

We analyzed Nationalgallery.org.uk page load time and found that the first response time was 244 ms and then it took 4.7 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

nationalgallery.org.uk performance score

31

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.0 s

49/100

10%

LCP (Largest Contentful Paint)

Value11.9 s

0/100

25%

SI (Speed Index)

Value8.0 s

21/100

10%

TBT (Total Blocking Time)

Value1,000 ms

27/100

30%

CLS (Cumulative Layout Shift)

Value0.044

99/100

15%

TTI (Time to Interactive)

Value13.7 s

10/100

10%

Network Requests Diagram

nationalgallery.org.uk

244 ms

www.nationalgallery.org.uk

655 ms

css2

45 ms

23d7ca35.673e94dc.d15420cc.204c0e97.40c36e3e.166a6c64.a946ba18.de597438.a0222058.b9f18378.c6034e92.cb34b3c2.758b3fcd.f4faf71b.f2d2e318.fa57febc.5dff469b.css.v202404251230

335 ms

uc.js

32 ms

Our browser made a total of 69 requests to load all elements on the main page. We found that 91% of them (63 requests) were addressed to the original Nationalgallery.org.uk, 3% (2 requests) were made to Googletagmanager.com and 1% (1 request) were made to Fonts.googleapis.com. The less responsive or slowest element that took the longest time to load (2.2 sec) belongs to the original domain Nationalgallery.org.uk.

Page Optimization Overview & Recommendations

Page size can be reduced by 260.6 kB (5%)

Content Size

5.0 MB

After Optimization

4.7 MB

In fact, the total size of Nationalgallery.org.uk main page is 5.0 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 50% of websites need less resources to load. Images take 4.6 MB which makes up the majority of the site volume.

HTML Optimization

-89%

Potential reduce by 93.6 kB

  • Original 105.2 kB
  • After minification 65.4 kB
  • After compression 11.6 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 39.8 kB, which is 38% 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 93.6 kB or 89% of the original size.

Image Optimization

-2%

Potential reduce by 77.8 kB

  • Original 4.6 MB
  • After minification 4.5 MB

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. National Gallery images are well optimized though.

JavaScript Optimization

-31%

Potential reduce by 88.6 kB

  • Original 285.5 kB
  • After minification 285.5 kB
  • After compression 196.9 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 88.6 kB or 31% of the original size.

CSS Optimization

-1%

Potential reduce by 683 B

  • Original 58.3 kB
  • After minification 58.3 kB
  • After compression 57.6 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. Nationalgallery.org.uk has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 9 (13%)

Requests Now

67

After Optimization

58

The browser has sent 67 CSS, Javascripts, AJAX and image requests in order to completely render the main page of National Gallery. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for JavaScripts and as a result speed up the page load time.

Accessibility Review

nationalgallery.org.uk 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.

Best Practices

nationalgallery.org.uk best practices score

92

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

Missing source maps for large first-party JavaScript

SEO Factors

nationalgallery.org.uk 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 Nationalgallery.org.uk 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 Nationalgallery.org.uk 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 National Gallery. 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: