Tools & Wizards About Us
letslab.com screenshot

Report Summary

  • 14

    Performance

    Renders faster than
    26% of other websites

  • 90

    Accessibility

    Visual factors better than
    that of 74% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 86

    SEO

    Google-friendlier than
    60% of websites

letslab.com

Letslab, global distributor of laboratory equipment

Page Load Speed

5.1 sec in total

First Response

749 ms

Resources Loaded

4.1 sec

Page Rendered

257 ms

letslab.com screenshot

About Website

Visit letslab.com now to see the best up-to-date Letslab content for Spain and also check out these interesting facts you probably never knew about letslab.com

Online distributor of laboratory material. Wide range of consumables, laboratory glass, scales, chemicals, reagents, agitators, scientific devices and microscopes.

Visit letslab.com

Key Findings

We analyzed Letslab.com page load time and found that the first response time was 749 ms and then it took 4.4 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.

Performance Metrics

letslab.com performance score

14

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.7 s

12/100

10%

LCP (Largest Contentful Paint)

Value13.6 s

0/100

25%

SI (Speed Index)

Value15.2 s

1/100

10%

TBT (Total Blocking Time)

Value1,870 ms

9/100

30%

CLS (Cumulative Layout Shift)

Value0.189

65/100

15%

TTI (Time to Interactive)

Value35.9 s

0/100

10%

Network Requests Diagram

www.letslab.com

749 ms

reset.css

225 ms

styles.css

229 ms

clears.css

228 ms

style.css

232 ms

Our browser made a total of 94 requests to load all elements on the main page. We found that 55% of them (52 requests) were addressed to the original Letslab.com, 11% (10 requests) were made to Static.xx.fbcdn.net and 9% (8 requests) were made to Static.letslab.com. The less responsive or slowest element that took the longest time to load (1.3 sec) relates to the external source Qweb.es.

Page Optimization Overview & Recommendations

Page size can be reduced by 719.8 kB (66%)

Content Size

1.1 MB

After Optimization

365.1 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Letslab.com main page is 1.1 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 751.9 kB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 102.2 kB

  • Original 128.4 kB
  • After minification 120.6 kB
  • After compression 26.3 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 102.2 kB or 80% of the original size.

Image Optimization

-13%

Potential reduce by 17.5 kB

  • Original 133.1 kB
  • After minification 115.6 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. Obviously, Letslab needs image optimization as it can save up to 17.5 kB or 13% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-72%

Potential reduce by 541.0 kB

  • Original 751.9 kB
  • After minification 644.3 kB
  • After compression 211.0 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 541.0 kB or 72% of the original size.

CSS Optimization

-83%

Potential reduce by 59.1 kB

  • Original 71.4 kB
  • After minification 54.0 kB
  • After compression 12.3 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. Letslab.com needs all CSS files to be minified and compressed as it can save up to 59.1 kB or 83% of the original size.

Requests Breakdown

Number of requests can be reduced by 44 (49%)

Requests Now

90

After Optimization

46

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 90 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Letslab. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 36 to 1 for JavaScripts and from 10 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

www.letslab.com

www.letslab.com

749 ms

reset.css

reset.css

225 ms

styles.css

styles.css

229 ms

clears.css

clears.css

228 ms

style.css

style.css

232 ms

downloads.css

downloads.css

299 ms

modalbox.css

modalbox.css

447 ms

cookienotice.css

cookienotice.css

449 ms

prototype.js

prototype.js

684 ms

validation.js

validation.js

460 ms

builder.js

builder.js

467 ms

effects.js

effects.js

513 ms

dragdrop.js

dragdrop.js

670 ms

controls.js

controls.js

673 ms

slider.js

slider.js

714 ms

js.js

js.js

715 ms

form.js

form.js

735 ms

menu.js

menu.js

886 ms

translate.js

translate.js

903 ms

cookies.js

cookies.js

895 ms

modalbox.js

modalbox.js

904 ms

downloads.js

downloads.js

902 ms

jquery.js

jquery.js

1073 ms

web.js

web.js

1106 ms

conversion.js

conversion.js

24 ms

plusone.js

plusone.js

153 ms

nivo.slider.pack.js

nivo.slider.pack.js

1125 ms

selloanimado.gif

selloanimado.gif

593 ms

certqweb-www.letslab.es.gif

certqweb-www.letslab.es.gif

1326 ms

77_1.jpg

77_1.jpg

394 ms

bg_body.png

bg_body.png

144 ms

bg_header_bokeh.jpg

bg_header_bokeh.jpg

228 ms

ico_phone_top.png

ico_phone_top.png

230 ms

twitter16.png

twitter16.png

382 ms

facebook16.png

facebook16.png

382 ms

feed16.png

feed16.png

381 ms

bg_top_barra.png

bg_top_barra.png

393 ms

button_topsearch.png

button_topsearch.png

484 ms

DELTALAB.jpg

DELTALAB.jpg

483 ms

Pobel.jpg

Pobel.jpg

583 ms

FILTER-LAB.jpg

FILTER-LAB.jpg

582 ms

AEARO-PELTOR.jpg

AEARO-PELTOR.jpg

605 ms

3M.jpg

3M.jpg

626 ms

powered.png

powered.png

723 ms

sponsored.png

sponsored.png

724 ms

82_1.jpg

82_1.jpg

394 ms

150154-ret.jpg

150154-ret.jpg

390 ms

ph.jpg

ph.jpg

391 ms

409402_1.jpg

409402_1.jpg

390 ms

futf.jpg

futf.jpg

389 ms

slear71448.jpg

slear71448.jpg

582 ms

9320.jpg

9320.jpg

583 ms

segoeui-webfont.woff

segoeui-webfont.woff

887 ms

doofinder-4.latest.min.js

doofinder-4.latest.min.js

40 ms

logo.png

logo.png

804 ms

toplinks_separador.png

toplinks_separador.png

818 ms

toplinks_icons.png

toplinks_icons.png

843 ms

66 ms

titol_newsletter_block.png

titol_newsletter_block.png

887 ms

botones_sidebar.png

botones_sidebar.png

898 ms

segoeuib-webfont.woff

segoeuib-webfont.woff

1107 ms

cb=gapi.loaded_0

cb=gapi.loaded_0

40 ms

fg_slider.png

fg_slider.png

992 ms

button_addcart.png

button_addcart.png

1028 ms

bg_footer.png

bg_footer.png

1075 ms

bg_subfooter.png

bg_subfooter.png

1098 ms

ga.js

ga.js

57 ms

78 ms

cb=gapi.loaded_1

cb=gapi.loaded_1

43 ms

fastbutton

fastbutton

119 ms

__utm.gif

__utm.gif

29 ms

postmessageRelay

postmessageRelay

47 ms

likebox.php

likebox.php

219 ms

api.js

api.js

191 ms

core:rpc:shindig.random:shindig.sha1.js

core:rpc:shindig.random:shindig.sha1.js

219 ms

2536007149-postmessagerelay.js

2536007149-postmessagerelay.js

195 ms

widget_v2.132.js

widget_v2.132.js

37 ms

cb=gapi.loaded_0

cb=gapi.loaded_0

144 ms

cb=gapi.loaded_1

cb=gapi.loaded_1

165 ms

grlryt2bdKIyfMSOhzd1eA.woff

grlryt2bdKIyfMSOhzd1eA.woff

202 ms

ga-audiences

ga-audiences

40 ms

jTuqQ-OPDr6.css

jTuqQ-OPDr6.css

188 ms

n370yiaI2G6.css

n370yiaI2G6.css

229 ms

_rx8naC75Dy.js

_rx8naC75Dy.js

308 ms

x5F9OMjKyLw.js

x5F9OMjKyLw.js

382 ms

ICDbTSzjQEg.js

ICDbTSzjQEg.js

307 ms

TTCre3391I0.js

TTCre3391I0.js

307 ms

185013_10151065642197007_1695859087_n.jpg

185013_10151065642197007_1695859087_n.jpg

162 ms

wL6VQj7Ab77.png

wL6VQj7Ab77.png

43 ms

s7jcwEQH7Sx.png

s7jcwEQH7Sx.png

44 ms

I6-MnjEovm5.js

I6-MnjEovm5.js

43 ms

vlXaquuXMrr.js

vlXaquuXMrr.js

45 ms

print.css

print.css

113 ms

4071318f0aa0f5d1e86e974794b7f406.js

4071318f0aa0f5d1e86e974794b7f406.js

179 ms

Accessibility Review

letslab.com accessibility score

90

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

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

letslab.com best practices score

75

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

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

letslab.com SEO score

86

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

High

Page is blocked from indexing

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

    ES

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Letslab.com can be misinterpreted by Google and other search engines. Our service has detected that Spanish is used on the page, and it does not match the claimed English language. Our system also found out that Letslab.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

letslab.com

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