Tools & Wizards About Us
booking.co.uk screenshot

Report Summary

  • 16

    Performance

    Renders faster than
    30% of other websites

  • 93

    Accessibility

    Visual factors better than
    that of 80% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 99

    SEO

    Google-friendlier than
    93% of websites

booking.co.uk

Booking.com | Official site | The best hotels, flights, car rentals & accommodations

Page Load Speed

2.2 sec in total

First Response

157 ms

Resources Loaded

1.7 sec

Page Rendered

340 ms

booking.co.uk screenshot

About Website

Visit booking.co.uk now to see the best up-to-date Booking content and also check out these interesting facts you probably never knew about booking.co.uk

Explore the world with Booking.com. Big savings on homes, hotels, flights, car rentals, taxis, and attractions – build your perfect trip on any budget.

Visit booking.co.uk

Key Findings

We analyzed Booking.co.uk page load time and found that the first response time was 157 ms and then it took 2.1 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 40% of websites can load faster.

Performance Metrics

booking.co.uk performance score

16

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.0 s

9/100

10%

LCP (Largest Contentful Paint)

Value15.8 s

0/100

25%

SI (Speed Index)

Value11.8 s

4/100

10%

TBT (Total Blocking Time)

Value6,020 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value39.9 s

0/100

10%

Network Requests Diagram

booking.co.uk

157 ms

index.en-gb.html

697 ms

cookie-banner.min.js

18 ms

2454015045ef79168d452ff4e7f30bdadff0aa81.js

17 ms

2ee63c50562eff5b15bd5494ec6df807b8ad79c2.css

24 ms

Our browser made a total of 153 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Booking.co.uk, 94% (144 requests) were made to Cf.bstatic.com and 1% (2 requests) were made to Securepubads.g.doubleclick.net. The less responsive or slowest element that took the longest time to load (697 ms) relates to the external source Booking.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 657.5 kB (13%)

Content Size

5.0 MB

After Optimization

4.3 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Booking.co.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. Only a small number of websites need less resources to load. Javascripts take 2.9 MB which makes up the majority of the site volume.

HTML Optimization

-72%

Potential reduce by 490.4 kB

  • Original 676.6 kB
  • After minification 675.9 kB
  • After compression 186.2 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 490.4 kB or 72% of the original size.

Image Optimization

-2%

Potential reduce by 15.1 kB

  • Original 772.1 kB
  • After minification 757.0 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. Booking images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 4.9 kB

  • Original 2.9 MB
  • After minification 2.9 MB
  • After compression 2.9 MB

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

-22%

Potential reduce by 147.1 kB

  • Original 655.7 kB
  • After minification 654.1 kB
  • After compression 508.5 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. Booking.co.uk needs all CSS files to be minified and compressed as it can save up to 147.1 kB or 22% of the original size.

Requests Breakdown

Number of requests can be reduced by 133 (88%)

Requests Now

151

After Optimization

18

  • Images
  • JavaScript
  • CSS

The browser has sent 151 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Booking. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 83 to 1 for JavaScripts and from 52 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

booking.co.uk

booking.co.uk

157 ms

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697 ms

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18 ms

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976884.jpg

97 ms

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976708.jpg

96 ms

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292260574.jpg

97 ms

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290483794.jpg

96 ms

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289320924.jpg

97 ms

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288594543.jpg

97 ms

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d59400a9e3fb1de83d0ecf952eef4e894acabc26.png

96 ms

Accessibility Review

booking.co.uk accessibility score

93

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 have valid values

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

booking.co.uk best practices score

67

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

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

booking.co.uk SEO score

99

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 Booking.co.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 Booking.co.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

booking.co.uk

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