Access shop.o2.co.uk. O2 Shop | Discover Our Best Phone, Tablet & SIM Only Deals

name

value

score

weighting

FCP (First Contentful Paint)

Value10.1 s

0/100

10%

LCP (Largest Contentful Paint)

Value17.2 s

0/100

25%

SI (Speed Index)

Value10.4 s

8/100

10%

TBT (Total Blocking Time)

Value1,010 ms

27/100

30%

CLS (Cumulative Layout Shift)

Value0.176

68/100

15%

TTI (Time to Interactive)

Value23.0 s

1/100

10%

shop

699 ms

combo

865 ms

main.css

49 ms

clay.css

1656 ms

main.css

725 ms

Our browser made a total of 113 requests to load all elements on the main page. We found that 0% of them (0 request) were addressed to the original Shop.o2.co.uk, 30% (34 requests) were made to Static-www.o2.co.uk and 3% (3 requests) were made to Assets.sitescdn.net. The less responsive or slowest element that took the longest time to load (2.3 sec) relates to the external source O2.co.uk.

Content Size

1.3 MB

After Optimization

954.6 kB

In fact, the total size of Shop.o2.co.uk main page is 1.3 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. 65% of websites need less resources to load. Javascripts take 497.3 kB which makes up the majority of the site volume.

HTML Optimization

-89%

Potential reduce by 279.9 kB

Original 313.5 kB
After minification 221.2 kB
After compression 33.6 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 92.3 kB, which is 29% 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 279.9 kB or 89% of the original size.

Image Optimization

-6%

Potential reduce by 27.6 kB

Original 460.8 kB
After minification 433.2 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. Shop O2 images are well optimized though.

JavaScript Optimization

-11%

Potential reduce by 52.9 kB

Original 497.3 kB
After minification 497.1 kB
After compression 444.4 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 52.9 kB or 11% of the original size.

CSS Optimization

-12%

Potential reduce by 6.2 kB

Original 49.6 kB
After minification 49.3 kB
After compression 43.4 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. Shop.o2.co.uk needs all CSS files to be minified and compressed as it can save up to 6.2 kB or 12% of the original size.

Requests Now

103

After Optimization

The browser has sent 103 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Shop O2. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 20 to 1 for JavaScripts and from 22 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

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.

High

button, link, and menuitem elements do not have accessible names.

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

High

Definition list items are not wrapped in <dl> elements

These items highlight common accessibility best practices.

High

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

These are opportunities to improve keyboard navigation in your application.

High

Some elements have a [tabindex] value greater than 0

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

Search Engine Optimization Advices

To appear in search results, crawlers need access to your app.

High

Links are not crawlable

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/).

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 Shop.o2.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 Shop.o2.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

shop.o2.co.uk

Open Graph description is not detected on the main page of Shop O2. 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:

Report Summary

Performance

Accessibility

Best Practices

SEO

O2 Shop | Discover Our Best Phone, Tablet & SIM Only Deals

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

shop

combo

main.css

clay.css

main.css

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

shop

combo

main.css

clay.css

main.css

combo

js_loader_config

combo

combo

combo

js_bundle_config

combo

main.css

combo

o2main.css

slick.css

slick-theme.css

utag.sync.js

main_o2.js

trustev.min.js

lux.js

hidden.module.css

global-nav.min.css

slick.css

answers.css

style.css

answerstemplates.compiled.min.js

answers.min.js

global-nav-webpack.js

lazyload.js

load.js

ae8bce7a-1e8b-8fb6-a203-11a55d1e05a5

main.css

main.css

staging.js

staging_branch.js

staging_version.js

main.css

main.css

main.css

main.css

main.css

main.js