3.5 sec in total
170 ms
3.1 sec
224 ms
Welcome to j-sainsbury.co.uk homepage info - get ready to check J Sainsbury best content for United Kingdom right away, or after learning these important things about j-sainsbury.co.uk
Sainsbury's
Visit j-sainsbury.co.ukWe analyzed J-sainsbury.co.uk page load time and found that the first response time was 170 ms and then it took 3.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 55% of websites can load faster.
j-sainsbury.co.uk performance score
name
value
score
weighting
Value4.5 s
14/100
10%
Value12.8 s
0/100
25%
Value7.0 s
32/100
10%
Value880 ms
32/100
30%
Value0.033
100/100
15%
Value11.1 s
20/100
10%
170 ms
746 ms
156 ms
310 ms
237 ms
Our browser made a total of 107 requests to load all elements on the main page. We found that 93% of them (100 requests) were addressed to the original J-sainsbury.co.uk, 2% (2 requests) were made to Google-analytics.com and 1% (1 request) were made to Cloud.webtype.com. The less responsive or slowest element that took the longest time to load (1.4 sec) belongs to the original domain J-sainsbury.co.uk.
Page size can be reduced by 449.8 kB (30%)
1.5 MB
1.1 MB
In fact, the total size of J-sainsbury.co.uk main page is 1.5 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. 40% of websites need less resources to load. Images take 1.0 MB which makes up the majority of the site volume.
Potential reduce by 67.8 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. This page needs HTML code to be minified as it can gain 12.3 kB, which is 15% 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 67.8 kB or 83% of the original size.
Potential reduce by 65.9 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. J Sainsbury images are well optimized though.
Potential reduce by 165.4 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 165.4 kB or 64% of the original size.
Potential reduce by 150.6 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. J-sainsbury.co.uk needs all CSS files to be minified and compressed as it can save up to 150.6 kB or 86% of the original size.
Number of requests can be reduced by 32 (31%)
103
71
The browser has sent 103 CSS, Javascripts, AJAX and image requests in order to completely render the main page of J Sainsbury. 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 10 to 1 for CSS and as a result speed up the page load time.
j-sainsbury.co.uk
170 ms
www.j-sainsbury.co.uk
746 ms
reset.css
156 ms
layout.css
310 ms
type.css
237 ms
color.css
241 ms
utility.css
162 ms
responsibility.css
164 ms
4e5ca451-d0a3-428d-877a-e8d16d5d8d52.css
57 ms
colorbox.css
234 ms
ga_social_tracking.js
242 ms
jquery-1.6.2.min.js
351 ms
jquery.min.js
33 ms
Combined_Plugins.js
322 ms
jquery.masonry.min.js
320 ms
equal-height.js
322 ms
common.js
348 ms
28d849
10 ms
ga.js
79 ms
prum.min.js
77 ms
bg_container_shadow.jpg
128 ms
bg_header_rounded.jpg
126 ms
JSainsburysplc_Header.jpg
197 ms
icon_search_global_submit.gif
126 ms
icon_link_arrow.gif
196 ms
bg_nav_main.gif
195 ms
bg_nav_main_divider.gif
196 ms
bg_nav_main_hover.gif
197 ms
bg_nav_main_current.gif
197 ms
ImageGen.ashx
221 ms
ImageGen.ashx
233 ms
ImageGen.ashx
237 ms
ImageGen.ashx
242 ms
ImageGen.ashx
244 ms
ImageGen.ashx
246 ms
corner_tr.png
300 ms
corner_bl.png
313 ms
corner_br.png
314 ms
ImageGen.ashx
330 ms
spr_tab_orange.png
322 ms
ImageGen.ashx
415 ms
ImageGen.ashx
467 ms
ImageGen.ashx
482 ms
ImageGen.ashx
475 ms
ImageGen.ashx
406 ms
icon_link_detail.gif
408 ms
icon_link_calculator.gif
486 ms
icon_link_history.gif
487 ms
icon_twitter_home.gif
496 ms
icon_carousel_news_nav.gif
545 ms
ImageGen.ashx
519 ms
ImageGen.ashx
526 ms
ImageGen.ashx
529 ms
ImageGen.ashx
528 ms
__utm.gif
53 ms
ImageGen.ashx
527 ms
ImageGen.ashx
540 ms
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543 ms
ImageGen.ashx
473 ms
ImageGen.ashx
481 ms
ImageGen.ashx
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ImageGen.ashx
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ImageGen.ashx
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ImageGen.ashx
594 ms
ImageGen.ashx
597 ms
ImageGen.ashx
541 ms
icon_facebook_home.gif
533 ms
icon_social_home_arrow.gif
573 ms
icon_youtube_home.gif
572 ms
icon_flickr_home.gif
595 ms
bg_footer_rounded.jpg
518 ms
ImageGen.ashx
1356 ms
icon_link_external.gif
511 ms
ImageGen.ashx
505 ms
ImageGen.ashx
510 ms
ImageGen.ashx
528 ms
ImageGen.ashx
523 ms
ImageGen.ashx
525 ms
ImageGen.ashx
561 ms
ImageGen.ashx
515 ms
ImageGen.ashx
537 ms
ImageGen.ashx
529 ms
ImageGen.ashx
527 ms
ImageGen.ashx
570 ms
ImageGen.ashx
554 ms
mary_ann_beta-medium-webfont.ttf
630 ms
mary_ann_beta-extrabold-webfont.ttf
613 ms
ImageGen.ashx
529 ms
ImageGen.ashx
569 ms
ImageGen.ashx
568 ms
ImageGen.ashx
616 ms
ImageGen.ashx
600 ms
spr_nav_btns.png
580 ms
bg_nav_sub_footer_divider.gif
590 ms
corner_tl.png
590 ms
corner_tl_grey.png
605 ms
corner_tr_grey.png
630 ms
corner_br_grey.png
592 ms
corner_bl_grey.png
603 ms
spr_notch.gif
585 ms
print.css
85 ms
nr-885.min.js
22 ms
j-sainsbury.co.uk accessibility score
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
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
<frame> or <iframe> elements do not have a title
Form elements do not have associated labels
Links do not have a discernible name
Best practices
These items highlight common accessibility best practices.
Impact
Issue
[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.
j-sainsbury.co.uk best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks
General
Impact
Issue
Detected JavaScript libraries
j-sainsbury.co.uk SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
Links are not crawlable
robots.txt is not valid
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
Document uses legible font sizes
Tap targets are not sized appropriately
EN
N/A
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise J-sainsbury.co.uk can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that J-sainsbury.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.
j-sainsbury.co.uk
Open Graph description is not detected on the main page of J Sainsbury. 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: