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costcoauto.co.uk screenshot

Report Summary

  • 45

    Performance

    Renders faster than
    64% of other websites

  • 80

    Accessibility

    Visual factors better than
    that of 49% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 83

    SEO

    Google-friendlier than
    46% of websites

costcoauto.co.uk

Member Savings on New Cars | Costco Auto Programme

Page Load Speed

3.3 sec in total

First Response

213 ms

Resources Loaded

2.4 sec

Page Rendered

721 ms

costcoauto.co.uk screenshot

About Website

Welcome to costcoauto.co.uk homepage info - get ready to check Costco Auto best content right away, or after learning these important things about costcoauto.co.uk

Enjoy exclusive prearranged pricing through Costco Auto Programme. Browse our latest deals and receive Costco member savings on popular models.

Visit costcoauto.co.uk

Key Findings

We analyzed Costcoauto.co.uk page load time and found that the first response time was 213 ms and then it took 3.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 55% of websites can load faster.

Performance Metrics

costcoauto.co.uk performance score

45

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.6 s

5/100

10%

LCP (Largest Contentful Paint)

Value8.3 s

2/100

25%

SI (Speed Index)

Value5.6 s

53/100

10%

TBT (Total Blocking Time)

Value330 ms

75/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value12.4 s

14/100

10%

Network Requests Diagram

costcoauto.co.uk

213 ms

www.costcoauto.co.uk

430 ms

css

191 ms

homepage.css

175 ms

owl.carousel.css

218 ms

Our browser made a total of 41 requests to load all elements on the main page. We found that 71% of them (29 requests) were addressed to the original Costcoauto.co.uk, 7% (3 requests) were made to Cdnjs.cloudflare.com and 5% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (739 ms) belongs to the original domain Costcoauto.co.uk.

Page Optimization Overview & Recommendations

Page size can be reduced by 804.1 kB (21%)

Content Size

3.8 MB

After Optimization

3.0 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Costcoauto.co.uk main page is 3.8 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. Images take 3.7 MB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 66.2 kB

  • Original 79.4 kB
  • After minification 60.9 kB
  • After compression 13.2 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. This page needs HTML code to be minified as it can gain 18.5 kB, which is 23% 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 66.2 kB or 83% of the original size.

Image Optimization

-20%

Potential reduce by 730.1 kB

  • Original 3.7 MB
  • After minification 2.9 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. Obviously, Costco Auto needs image optimization as it can save up to 730.1 kB or 20% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-9%

Potential reduce by 7.4 kB

  • Original 86.6 kB
  • After minification 86.6 kB
  • After compression 79.2 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. This website has mostly compressed JavaScripts.

CSS Optimization

-34%

Potential reduce by 396 B

  • Original 1.2 kB
  • After minification 1.0 kB
  • After compression 768 B

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. Costcoauto.co.uk needs all CSS files to be minified and compressed as it can save up to 396 B or 34% of the original size.

Requests Breakdown

Number of requests can be reduced by 14 (37%)

Requests Now

38

After Optimization

24

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 38 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Costco Auto. 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 6 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

costcoauto.co.uk

costcoauto.co.uk

213 ms

www.costcoauto.co.uk

www.costcoauto.co.uk

430 ms

css

css

191 ms

homepage.css

homepage.css

175 ms

owl.carousel.css

owl.carousel.css

218 ms

owl.theme.default.css

owl.theme.default.css

225 ms

layout.css

layout.css

247 ms

AllStyles

AllStyles

609 ms

MicrosoftAjax.js

MicrosoftAjax.js

402 ms

ScriptResource.axd

ScriptResource.axd

396 ms

ScriptResource.axd

ScriptResource.axd

318 ms

application

application

319 ms

AllUIScriptsJs

AllUIScriptsJs

394 ms

owl.carousel.min.js

owl.carousel.min.js

234 ms

gtm.js

gtm.js

258 ms

cap-logo.png

cap-logo.png

237 ms

vauxhall-logo-125x75.png

vauxhall-logo-125x75.png

235 ms

VX_AST_33341_500x388.png

VX_AST_33341_500x388.png

471 ms

VX_COR_33372_500x388.png

VX_COR_33372_500x388.png

597 ms

VX_COR_e_31496_500x388.png

VX_COR_e_31496_500x388.png

595 ms

VX_CRO_33390_500x388.png

VX_CRO_33390_500x388.png

434 ms

VX_GRA_32069_500x388.png

VX_GRA_32069_500x388.png

729 ms

VX_MOK_33377_500x388.png

VX_MOK_33377_500x388.png

592 ms

mokka-hatchback-1.2-turbo-100-SRi-5dr.jpg

mokka-hatchback-1.2-turbo-100-SRi-5dr.jpg

594 ms

plogo.png

plogo.png

593 ms

Arcana_red_TCe-140.jpg

Arcana_red_TCe-140.jpg

739 ms

19003-THEALL-NEWCAPTURE-TECHHYBRID_500x388.png

19003-THEALL-NEWCAPTURE-TECHHYBRID_500x388.png

627 ms

15347-All-newRenaultClio_500x388.png

15347-All-newRenaultClio_500x388.png

629 ms

NewRenaultKadjar.jpeg

NewRenaultKadjar.jpeg

722 ms

zoe.jpg

zoe.jpg

623 ms

mainbg.jpg

mainbg.jpg

310 ms

analytics.js

analytics.js

160 ms

hotjar-1164522.js

hotjar-1164522.js

403 ms

KFOmCnqEu92Fr1Mu4mxP.ttf

KFOmCnqEu92Fr1Mu4mxP.ttf

255 ms

how-it-works-bg.jpg

how-it-works-bg.jpg

254 ms

pandsbg.jpg

pandsbg.jpg

259 ms

collect

collect

170 ms

opentracker.aap

opentracker.aap

223 ms

collect

collect

105 ms

modules.f0cd1ed70b545da08b60.js

modules.f0cd1ed70b545da08b60.js

22 ms

box-69edcc3187336f9b0a3fbb4c73be9fe6.html

box-69edcc3187336f9b0a3fbb4c73be9fe6.html

36 ms

Accessibility Review

costcoauto.co.uk accessibility score

80

Accessibility Issues

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

Image elements do not have [alt] attributes

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

costcoauto.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

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

costcoauto.co.uk SEO score

83

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

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Image elements do not have [alt] attributes

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

    N/A

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Costcoauto.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 Costcoauto.co.uk main page’s claimed encoding is . Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

costcoauto.co.uk

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