Report Summary

  • 39

    Performance

    Renders faster than
    59% of other websites

  • 94

    Accessibility

    Visual factors better than
    that of 84% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 100

    SEO

    Google-friendlier than
    95% of websites

johnlewis.co.uk

John Lewis & Partners | Department Store | Home, Fashion, Tech & More

Page Load Speed

6.3 sec in total

First Response

1.1 sec

Resources Loaded

4.8 sec

Page Rendered

421 ms

johnlewis.co.uk screenshot

About Website

Click here to check amazing John Lewis content for United Kingdom. Otherwise, check out these important facts you probably never knew about johnlewis.co.uk

Shop latest trends and launches across Home, Fashion & Tech at John Lewis & Partners. Providing an inspiring wide range of products, for all life's moments.

Visit johnlewis.co.uk

Key Findings

We analyzed Johnlewis.co.uk page load time and found that the first response time was 1.1 sec and then it took 5.2 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

johnlewis.co.uk performance score

39

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.4 s

37/100

10%

LCP (Largest Contentful Paint)

Value9.5 s

0/100

25%

SI (Speed Index)

Value4.8 s

67/100

10%

TBT (Total Blocking Time)

Value740 ms

40/100

30%

CLS (Cumulative Layout Shift)

Value0.047

99/100

15%

TTI (Time to Interactive)

Value10.8 s

22/100

10%

Network Requests Diagram

www.johnlewis.com

1096 ms

min__jl.common.1.css_1456277719000min_jl.common.1.css

358 ms

min__jl.common.2.css_1456277719000min_jl.common.2.css

884 ms

min__jl.common.3.css_1456277719000min_jl.common.3.css

532 ms

min__jl.content.css_1456277719000min_jl.content.css

539 ms

Our browser made a total of 193 requests to load all elements on the main page. We found that 0% of them (0 request) were addressed to the original Johnlewis.co.uk, 23% (45 requests) were made to Johnlewis.com and 5% (10 requests) were made to Johnlewis.ugc.bazaarvoice.com. The less responsive or slowest element that took the longest time to load (1.1 sec) relates to the external source Johnlewis.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.4 MB (52%)

Content Size

2.6 MB

After Optimization

1.2 MB

In fact, the total size of Johnlewis.co.uk main page is 2.6 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. 70% of websites need less resources to load. Javascripts take 894.6 kB which makes up the majority of the site volume.

HTML Optimization

-85%

Potential reduce by 232.8 kB

  • Original 274.5 kB
  • After minification 223.3 kB
  • After compression 41.6 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 51.1 kB, which is 19% 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 232.8 kB or 85% of the original size.

Image Optimization

-2%

Potential reduce by 14.2 kB

  • Original 817.9 kB
  • After minification 803.7 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. John Lewis images are well optimized though.

JavaScript Optimization

-68%

Potential reduce by 609.7 kB

  • Original 894.6 kB
  • After minification 892.1 kB
  • After compression 285.0 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 609.7 kB or 68% of the original size.

CSS Optimization

-81%

Potential reduce by 512.3 kB

  • Original 629.0 kB
  • After minification 626.4 kB
  • After compression 116.8 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. Johnlewis.co.uk needs all CSS files to be minified and compressed as it can save up to 512.3 kB or 81% of the original size.

Requests Breakdown

Number of requests can be reduced by 87 (47%)

Requests Now

185

After Optimization

98

The browser has sent 185 CSS, Javascripts, AJAX and image requests in order to completely render the main page of John Lewis. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 44 to 1 for JavaScripts and from 13 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

johnlewis.co.uk accessibility score

94

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

[id] attributes on active, focusable elements are not unique

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

Links do not have a discernible name

Best Practices

johnlewis.co.uk 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

johnlewis.co.uk SEO score

100

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

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 Johnlewis.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 Johnlewis.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

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