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cz.johnlewis.com screenshot

Report Summary

  • 23

    Performance

    Renders faster than
    41% of other websites

  • 90

    Accessibility

    Visual factors better than
    that of 74% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 93

    SEO

    Google-friendlier than
    83% of websites

cz.johnlewis.com

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

Page Load Speed

32.2 sec in total

First Response

266 ms

Resources Loaded

22.2 sec

Page Rendered

9.7 sec

cz.johnlewis.com screenshot

About Website

Welcome to cz.johnlewis.com homepage info - get ready to check Cz John Lewis best content for United Kingdom right away, or after learning these important things about cz.johnlewis.com

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 cz.johnlewis.com

Key Findings

We analyzed Cz.johnlewis.com page load time and found that the first response time was 266 ms and then it took 31.9 sec to load all DOM resources and completely render a web page. This is a poor result, as 95% of websites can load faster. Unfortunately, there were 2 request timeouts, which can generally increase the web page load time, as the browser stays idle while waiting for website response.

Performance Metrics

cz.johnlewis.com performance score

23

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.2 s

42/100

10%

LCP (Largest Contentful Paint)

Value15.5 s

0/100

25%

SI (Speed Index)

Value7.0 s

32/100

10%

TBT (Total Blocking Time)

Value3,570 ms

1/100

30%

CLS (Cumulative Layout Shift)

Value0.001

100/100

15%

TTI (Time to Interactive)

Value24.2 s

0/100

10%

Network Requests Diagram

www.johnlewis.com

266 ms

newrelic.js

20 ms

jl-init-metrics.6badcf8f.js

120 ms

Bootstrap.js

152 ms

entry.js

61 ms

Our browser made a total of 124 requests to load all elements on the main page. We found that 0% of them (0 request) were addressed to the original Cz.johnlewis.com, 24% (30 requests) were made to Johnlewis.scene7.com and 1% (1 request) were made to Tags.johnlewis.com. The less responsive or slowest element that took the longest time to load (20 sec) relates to the external source Johnlewis.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 718.7 kB (30%)

Content Size

2.4 MB

After Optimization

1.7 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Cz.johnlewis.com main page is 2.4 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. 75% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 1.5 MB which makes up the majority of the site volume.

HTML Optimization

-92%

Potential reduce by 577.1 kB

  • Original 625.9 kB
  • After minification 608.6 kB
  • After compression 48.8 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. 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 577.1 kB or 92% of the original size.

Image Optimization

-0%

Potential reduce by 0 B

  • Original 1.5 MB
  • After minification 1.5 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. Cz John Lewis images are well optimized though.

JavaScript Optimization

-46%

Potential reduce by 120.2 kB

  • Original 263.9 kB
  • After minification 263.9 kB
  • After compression 143.7 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 120.2 kB or 46% of the original size.

CSS Optimization

-46%

Potential reduce by 21.4 kB

  • Original 45.9 kB
  • After minification 45.8 kB
  • After compression 24.6 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. Cz.johnlewis.com needs all CSS files to be minified and compressed as it can save up to 21.4 kB or 46% of the original size.

Requests Breakdown

Number of requests can be reduced by 78 (69%)

Requests Now

113

After Optimization

35

  • Images
  • JavaScript
  • CSS

The browser has sent 113 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Cz 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 49 to 1 for JavaScripts and from 26 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

www.johnlewis.com

www.johnlewis.com

266 ms

newrelic.js

newrelic.js

20 ms

jl-init-metrics.6badcf8f.js

jl-init-metrics.6badcf8f.js

120 ms

Bootstrap.js

Bootstrap.js

152 ms

entry.js

entry.js

61 ms

jlp-styles-jb.css

jlp-styles-jb.css

37 ms

jlp-vendor-polyfills.js

jlp-vendor-polyfills.js

30 ms

59cd0650198d6bd4124f.css

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30 ms

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polyfills-a40ef1678bae11e696dba45124eadd70.js

33 ms

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webpack-936d92c2ee460b7f815d.js

25 ms

framework-6112039f861e80a04131.js

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37 ms

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39 ms

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38 ms

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42 ms

_buildManifest.js

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51 ms

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58 ms

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52 ms

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51 ms

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53 ms

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66 ms

config.js

config.js

62 ms

auth.js

auth.js

64 ms

scaffold-vendor-13d47.js

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73 ms

scaffold-87e25.js

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75 ms

jl-recommendations-panel.js

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71 ms

main-8b64e.css

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72 ms

commonResponsiveContainer-a9199.css

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78 ms

commonHrefHelper-23af5.css

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82 ms

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83 ms

commonImage-89b21.css

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84 ms

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83 ms

AEMContainerWrapper-91ded.css

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92 ms

AEMDividerWrapper-62ade.css

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96 ms

AEMTitleWrapper-9c006.css

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89 ms

AEMOverlayWrapper-4e3dc.css

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93 ms

AEMForegroundContainer-4e3dc.css

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106 ms

AEMImageWrapper-994a4.css

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95 ms

AEMButtonPrimaryWrapper-59402.css

AEMButtonPrimaryWrapper-59402.css

107 ms

AEMCopyWrapper-9c006.css

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99 ms

AEMCustomisableHeadingWrapper-e0d0a.css

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83 ms

AEMTextLineWrapper-c89d7.css

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81 ms

AEMButtonSecondaryWrapper-59402.css

AEMButtonSecondaryWrapper-59402.css

90 ms

AEMCardCarouselWrapper-794cf.css

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86 ms

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AEMCardButtonWrapper-b3eab.css

94 ms

AEMButtonTertiaryWrapper-59402.css

AEMButtonTertiaryWrapper-59402.css

86 ms

AEMButtonCarouselWrapper-126b1.css

AEMButtonCarouselWrapper-126b1.css

97 ms

main-9adad.bundle.js

main-9adad.bundle.js

86 ms

commonResponsiveContainer-8563e.bundle.js

commonResponsiveContainer-8563e.bundle.js

89 ms

commonHrefHelper-10c06.bundle.js

commonHrefHelper-10c06.bundle.js

92 ms

commonButton-eecd1.bundle.js

commonButton-eecd1.bundle.js

77 ms

commonImage-90151.bundle.js

commonImage-90151.bundle.js

82 ms

commonCopy-5ccf9.bundle.js

commonCopy-5ccf9.bundle.js

89 ms

AEMContentPage-3be74.bundle.js

AEMContentPage-3be74.bundle.js

588 ms

AEMResponsiveContainerWrapper-a6601.bundle.js

AEMResponsiveContainerWrapper-a6601.bundle.js

87 ms

AEMContainerWrapper-8cbc4.bundle.js

AEMContainerWrapper-8cbc4.bundle.js

82 ms

AEMDividerWrapper-b97e7.bundle.js

AEMDividerWrapper-b97e7.bundle.js

76 ms

AEMTitleWrapper-10b03.bundle.js

AEMTitleWrapper-10b03.bundle.js

573 ms

AEMOverlayWrapper-60011.bundle.js

AEMOverlayWrapper-60011.bundle.js

570 ms

AEMFragmentWrapper-7535a.bundle.js

AEMFragmentWrapper-7535a.bundle.js

566 ms

AEMForegroundContainer-fb844.bundle.js

AEMForegroundContainer-fb844.bundle.js

567 ms

AEMImageWrapper-8dba6.bundle.js

AEMImageWrapper-8dba6.bundle.js

566 ms

AEMButtonPrimaryWrapper-2a235.bundle.js

AEMButtonPrimaryWrapper-2a235.bundle.js

567 ms

AEMCopyWrapper-32575.bundle.js

AEMCopyWrapper-32575.bundle.js

558 ms

AEMCustomisableHeadingWrapper-72fb2.bundle.js

AEMCustomisableHeadingWrapper-72fb2.bundle.js

560 ms

AEMTextLineWrapper-8e7df.bundle.js

AEMTextLineWrapper-8e7df.bundle.js

559 ms

AEMButtonSecondaryWrapper-006ad.bundle.js

AEMButtonSecondaryWrapper-006ad.bundle.js

561 ms

AEMRecommendationsPanelWrapper-96a33.bundle.js

AEMRecommendationsPanelWrapper-96a33.bundle.js

559 ms

AEMCardCarouselWrapper-1d1d4.bundle.js

AEMCardCarouselWrapper-1d1d4.bundle.js

554 ms

AEMCardButtonWrapper-8b9e9.bundle.js

AEMCardButtonWrapper-8b9e9.bundle.js

549 ms

AEMButtonTertiaryWrapper-ff1ae.bundle.js

AEMButtonTertiaryWrapper-ff1ae.bundle.js

555 ms

AEMButtonCarouselWrapper-83f87.bundle.js

AEMButtonCarouselWrapper-83f87.bundle.js

551 ms

recently-viewed-items.js

recently-viewed-items.js

547 ms

main.09d10511.js

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545 ms

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544 ms

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1153 ms

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1355 ms

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1229 ms

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1234 ms

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1234 ms

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1235 ms

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profile-24px-outlined.svg

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1090 ms

wishlist-24px-outlined.svg

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1091 ms

basket-24px-outlined.svg

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1170 ms

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state

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157 ms

Accessibility Review

cz.johnlewis.com accessibility score

90

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-hidden="true"] elements contain focusable descendents

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

Buttons do not have an accessible name

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

cz.johnlewis.com 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

cz.johnlewis.com 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 Cz.johnlewis.com 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 Cz.johnlewis.com 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

cz.johnlewis.com

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