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centrica.com screenshot

Report Summary

  • 48

    Performance

    Renders faster than
    67% of other websites

  • 77

    Accessibility

    Visual factors better than
    that of 45% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 75

    SEO

    Google-friendlier than
    32% of websites

centrica.com

Centrica | Home

Page Load Speed

2.8 sec in total

First Response

304 ms

Resources Loaded

2 sec

Page Rendered

402 ms

centrica.com screenshot

About Website

Welcome to centrica.com homepage info - get ready to check Centrica best content for United Kingdom right away, or after learning these important things about centrica.com

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Key Findings

We analyzed Centrica.com page load time and found that the first response time was 304 ms and then it took 2.4 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 45% of websites can load faster.

Performance Metrics

centrica.com performance score

48

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.6 s

63/100

10%

LCP (Largest Contentful Paint)

Value9.1 s

1/100

25%

SI (Speed Index)

Value7.9 s

22/100

10%

TBT (Total Blocking Time)

Value280 ms

81/100

30%

CLS (Cumulative Layout Shift)

Value0.072

96/100

15%

TTI (Time to Interactive)

Value18.4 s

3/100

10%

Network Requests Diagram

www.centrica.com

304 ms

www.centrica.com

887 ms

css_rpg94snLPM11Nu5bCg9dXrdXTf3xdz62C0hZY3J7wRA.css

7 ms

css_JtplZ6FOxGSGXUW5IQ3mhynpuhbR47ON6JNUTkazKNY.css

12 ms

css_Sz2xb4uPoevxwW7aLIl0ZoQ4oPLY1Ii85HUPJoWK1EE.css

13 ms

Our browser made a total of 56 requests to load all elements on the main page. We found that 91% of them (51 requests) were addressed to the original Centrica.com, 4% (2 requests) were made to Google-analytics.com and 2% (1 request) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (887 ms) belongs to the original domain Centrica.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 898.0 kB (15%)

Content Size

6.2 MB

After Optimization

5.3 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Centrica.com main page is 6.2 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 5.4 MB which makes up the majority of the site volume.

HTML Optimization

-82%

Potential reduce by 57.0 kB

  • Original 69.2 kB
  • After minification 68.0 kB
  • After compression 12.2 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 57.0 kB or 82% of the original size.

Image Optimization

-5%

Potential reduce by 272.3 kB

  • Original 5.4 MB
  • After minification 5.1 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. Centrica images are well optimized though.

JavaScript Optimization

-62%

Potential reduce by 218.5 kB

  • Original 350.0 kB
  • After minification 350.0 kB
  • After compression 131.6 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 218.5 kB or 62% of the original size.

CSS Optimization

-87%

Potential reduce by 350.3 kB

  • Original 401.3 kB
  • After minification 396.0 kB
  • After compression 51.1 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. Centrica.com needs all CSS files to be minified and compressed as it can save up to 350.3 kB or 87% of the original size.

Requests Breakdown

Number of requests can be reduced by 13 (25%)

Requests Now

51

After Optimization

38

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 51 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Centrica. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 11 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

www.centrica.com

www.centrica.com

304 ms

www.centrica.com

www.centrica.com

887 ms

css_rpg94snLPM11Nu5bCg9dXrdXTf3xdz62C0hZY3J7wRA.css

css_rpg94snLPM11Nu5bCg9dXrdXTf3xdz62C0hZY3J7wRA.css

7 ms

css_JtplZ6FOxGSGXUW5IQ3mhynpuhbR47ON6JNUTkazKNY.css

css_JtplZ6FOxGSGXUW5IQ3mhynpuhbR47ON6JNUTkazKNY.css

12 ms

css_Sz2xb4uPoevxwW7aLIl0ZoQ4oPLY1Ii85HUPJoWK1EE.css

css_Sz2xb4uPoevxwW7aLIl0ZoQ4oPLY1Ii85HUPJoWK1EE.css

13 ms

css_6xTF2tcKY04jegpCRhPOJq-3SZbeDe2U6TlhFya_c8A.css

css_6xTF2tcKY04jegpCRhPOJq-3SZbeDe2U6TlhFya_c8A.css

20 ms

js_pPx82f2NEgcdA0dGig51elAOdhZikdCvHgf8UnEy7_s.js

js_pPx82f2NEgcdA0dGig51elAOdhZikdCvHgf8UnEy7_s.js

18 ms

js_PmvA1as8yACsqJggmTNlrcWaldAR5bMSgj4gSTFRk6U.js

js_PmvA1as8yACsqJggmTNlrcWaldAR5bMSgj4gSTFRk6U.js

17 ms

js_9QIJrVYjlN3UieSbObrEJFKvVcg0iLX5vxoew9nwnMw.js

js_9QIJrVYjlN3UieSbObrEJFKvVcg0iLX5vxoew9nwnMw.js

15 ms

js_0x07_y2mGZb7_LU6kamWKVLJGs9RNU2iWMoRR9UcU9k.js

js_0x07_y2mGZb7_LU6kamWKVLJGs9RNU2iWMoRR9UcU9k.js

60 ms

js_FBnc_-TEtgBUZfGzcsNXWZDYiXNlAcGR1_cvcnTpGTg.js

js_FBnc_-TEtgBUZfGzcsNXWZDYiXNlAcGR1_cvcnTpGTg.js

63 ms

js_pANdSMOzevA-PBrnj1P_lEXHgcUATZV3CEsvM-hcQpM.js

js_pANdSMOzevA-PBrnj1P_lEXHgcUATZV3CEsvM-hcQpM.js

109 ms

gtm.js

gtm.js

402 ms

logo.png

logo.png

325 ms

header.png

header.png

327 ms

news.png

news.png

348 ms

investors.png

investors.png

356 ms

405x403-selection_01_06_2015_007.png

405x403-selection_01_06_2015_007.png

407 ms

tile-1.jpg

tile-1.jpg

326 ms

379x376-selection_29_05_2015_010.png

379x376-selection_29_05_2015_010.png

428 ms

377x376-selection_29_05_2015_008.png

377x376-selection_29_05_2015_008.png

405 ms

aprent-tile.png

aprent-tile.png

363 ms

woman_on_the_phone_500_x_500.jpg

woman_on_the_phone_500_x_500.jpg

354 ms

share-price-widget-sprite.png

share-price-widget-sprite.png

362 ms

share-price-background.jpg

share-price-background.jpg

363 ms

centrica-customer-carousel1.jpg

centrica-customer-carousel1.jpg

407 ms

bord_gais.png

bord_gais.png

364 ms

british_gas.png

british_gas.png

409 ms

centrica_0.jpg

centrica_0.jpg

408 ms

centrica_storage.png

centrica_storage.png

412 ms

direct_energy.png

direct_energy.png

411 ms

dyno.png

dyno.png

409 ms

hive_logo_hi-res_420wx200h.jpg

hive_logo_hi-res_420wx200h.jpg

413 ms

shares-bg.jpg

shares-bg.jpg

412 ms

centrica.jpg

centrica.jpg

417 ms

default_news_item_teaser_image_1.png

default_news_item_teaser_image_1.png

423 ms

careers-bg-engineer-smart-female-tile.jpg

careers-bg-engineer-smart-female-tile.jpg

414 ms

tile.jpg

tile.jpg

413 ms

careers-midstream-office-tile.jpg

careers-midstream-office-tile.jpg

416 ms

careers-engineer-apprentice-safety-tile.jpg

careers-engineer-apprentice-safety-tile.jpg

414 ms

careers-exploration-subsurface-offshore-tile.jpg

careers-exploration-subsurface-offshore-tile.jpg

417 ms

careers-hummingbird-offshore-v2-tile.jpg

careers-hummingbird-offshore-v2-tile.jpg

418 ms

default_news_item_teaser_image.png

default_news_item_teaser_image.png

421 ms

british_gas_logo_500_x_500_ish.jpg

british_gas_logo_500_x_500_ish.jpg

419 ms

hive_new_products_-_group.jpg

hive_new_products_-_group.jpg

420 ms

centrica_solarfarm_carbon_tile.jpg

centrica_solarfarm_carbon_tile.jpg

425 ms

social-links-sprite.png

social-links-sprite.png

425 ms

_Incapsula_Resource

_Incapsula_Resource

423 ms

OpenSansRegular.woff

OpenSansRegular.woff

120 ms

OpenSansLight.woff

OpenSansLight.woff

107 ms

OpenSansBold.woff

OpenSansBold.woff

107 ms

analytics.js

analytics.js

119 ms

hotjar-72450.js

hotjar-72450.js

183 ms

e8C.js

e8C.js

86 ms

_Incapsula_Resource

_Incapsula_Resource

9 ms

collect

collect

35 ms

Accessibility Review

centrica.com accessibility score

77

Accessibility Issues

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

High

Image elements do not have [alt] attributes

High

Links do not have a discernible 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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

High

Some elements have a [tabindex] value greater than 0

Best Practices

centrica.com best practices score

83

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

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

centrica.com SEO score

75

Search Engine Optimization Advices

Content Best Practices

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

Impact

Issue

High

Links do not have descriptive text

High

Image elements do not have [alt] attributes

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

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 Centrica.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 Centrica.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

centrica.com

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