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keller.lu screenshot

Report Summary

  • 28

    Performance

    Renders faster than
    48% of other websites

  • 88

    Accessibility

    Visual factors better than
    that of 68% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 86

    SEO

    Google-friendlier than
    60% of websites

keller.lu

Homepage | Keller minimal windows

Page Load Speed

3.8 sec in total

First Response

420 ms

Resources Loaded

2.9 sec

Page Rendered

488 ms

keller.lu screenshot

About Website

Visit keller.lu now to see the best up-to-date Keller content and also check out these interesting facts you probably never knew about keller.lu

Homepage | Keller minimal windows

Visit keller.lu

Key Findings

We analyzed Keller.lu page load time and found that the first response time was 420 ms and then it took 3.4 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.

Performance Metrics

keller.lu performance score

28

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.0 s

24/100

10%

LCP (Largest Contentful Paint)

Value5.9 s

14/100

25%

SI (Speed Index)

Value6.4 s

41/100

10%

TBT (Total Blocking Time)

Value1,940 ms

8/100

30%

CLS (Cumulative Layout Shift)

Value0.06

98/100

15%

TTI (Time to Interactive)

Value14.2 s

9/100

10%

Network Requests Diagram

keller.lu

420 ms

www.kellerag.com

245 ms

www.kellerag.com

413 ms

stylesheet_e39ff6f80e.css

81 ms

layout.css

157 ms

Our browser made a total of 60 requests to load all elements on the main page. We found that 2% of them (1 request) were addressed to the original Keller.lu, 90% (54 requests) were made to Kellerag.com and 3% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (1.1 sec) relates to the external source Kellerag.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 510.3 kB (13%)

Content Size

3.8 MB

After Optimization

3.3 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Keller.lu 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. 45% of websites need less resources to load. Images take 3.2 MB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 32.4 kB

  • Original 39.9 kB
  • After minification 36.7 kB
  • After compression 7.6 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. 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 32.4 kB or 81% of the original size.

Image Optimization

-1%

Potential reduce by 16.5 kB

  • Original 3.2 MB
  • After minification 3.2 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. Keller images are well optimized though.

JavaScript Optimization

-70%

Potential reduce by 292.4 kB

  • Original 415.8 kB
  • After minification 372.8 kB
  • After compression 123.4 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 292.4 kB or 70% of the original size.

CSS Optimization

-84%

Potential reduce by 169.1 kB

  • Original 200.4 kB
  • After minification 168.1 kB
  • After compression 31.3 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. Keller.lu needs all CSS files to be minified and compressed as it can save up to 169.1 kB or 84% of the original size.

Requests Breakdown

Number of requests can be reduced by 23 (46%)

Requests Now

50

After Optimization

27

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 50 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Keller. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 15 to 1 for JavaScripts and from 10 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

keller.lu

keller.lu

420 ms

www.kellerag.com

www.kellerag.com

245 ms

www.kellerag.com

www.kellerag.com

413 ms

stylesheet_e39ff6f80e.css

stylesheet_e39ff6f80e.css

81 ms

layout.css

layout.css

157 ms

bootstrap.css

bootstrap.css

321 ms

slideshow.css

slideshow.css

234 ms

jquery.smartmenus.bootstrap.css

jquery.smartmenus.bootstrap.css

234 ms

jquery.fancybox.css

jquery.fancybox.css

235 ms

jquery-2.1.1.min.js

jquery-2.1.1.min.js

331 ms

jquery.min.js

jquery.min.js

25 ms

bootstrap.js

bootstrap.js

249 ms

jquery.smartmenus.js

jquery.smartmenus.js

311 ms

jquery.smartmenus.bootstrap.js

jquery.smartmenus.bootstrap.js

306 ms

ie10-viewport-bug-workaround.js

ie10-viewport-bug-workaround.js

307 ms

jssor.slider.mini.js

jssor.slider.mini.js

419 ms

jquery.fancybox.pack.js

jquery.fancybox.pack.js

385 ms

init.js

init.js

387 ms

jquery.datetimepicker.min.js

jquery.datetimepicker.min.js

389 ms

parsley.min.js

parsley.min.js

392 ms

Tabs.min.js

Tabs.min.js

397 ms

Form.min.js

Form.min.js

459 ms

Marketing.min.js

Marketing.min.js

459 ms

css

css

60 ms

font-awesome.min.css

font-awesome.min.css

319 ms

content.css

content.css

323 ms

basemod.css

basemod.css

330 ms

KELLER_Logo.svg

KELLER_Logo.svg

220 ms

arrow.png

arrow.png

222 ms

loading.GIF

loading.GIF

222 ms

csm_KELLER_Sonnenschutz_Warema_Sonnensegel-Raffstoren_422588bfc9.jpg

csm_KELLER_Sonnenschutz_Warema_Sonnensegel-Raffstoren_422588bfc9.jpg

223 ms

csm_Architect-%40-work_Luxembourg-2016_0862013c8c.png

csm_Architect-%40-work_Luxembourg-2016_0862013c8c.png

216 ms

csm_KEL_Imagebroschuere_KWW_01_45d1e12d68.jpg

csm_KEL_Imagebroschuere_KWW_01_45d1e12d68.jpg

221 ms

csm_Export-Award_2015-2016_e02a8105f8.jpg

csm_Export-Award_2015-2016_e02a8105f8.jpg

363 ms

csm_Mit-KELLER-gewinnen-2016_800x800_3317392433.jpg

csm_Mit-KELLER-gewinnen-2016_800x800_3317392433.jpg

360 ms

csm_KELLER_minimal-windows-Fenster_4191_7d17069958.jpg

csm_KELLER_minimal-windows-Fenster_4191_7d17069958.jpg

369 ms

csm_KELLER-Galerie_145f64cc90.jpg

csm_KELLER-Galerie_145f64cc90.jpg

361 ms

csm_STO_kel1501_069_cb6e980017.jpg

csm_STO_kel1501_069_cb6e980017.jpg

363 ms

csm_KELLER_Orangerie-Elegance_1924b_a726322d08.jpg

csm_KELLER_Orangerie-Elegance_1924b_a726322d08.jpg

439 ms

csm_Perfektion_KEL_1219_8df1881b2a.jpg

csm_Perfektion_KEL_1219_8df1881b2a.jpg

514 ms

csm_Energieeffizienz_KEL_3328_6491b8b8be.jpg

csm_Energieeffizienz_KEL_3328_6491b8b8be.jpg

440 ms

csm_KELLER_Glashouse_offene-Ecke-ohne-stoerende_Pfosten_3778_c578a0e0d6.jpg

csm_KELLER_Glashouse_offene-Ecke-ohne-stoerende_Pfosten_3778_c578a0e0d6.jpg

516 ms

csm_KEL_Orangerie-Elegance_Landhaus-Stil_2196_cbbc952212.jpg

csm_KEL_Orangerie-Elegance_Landhaus-Stil_2196_cbbc952212.jpg

442 ms

block-rolllover.png

block-rolllover.png

441 ms

block-rolllover-onlyImg.png

block-rolllover-onlyImg.png

506 ms

block-rolllover-over.png

block-rolllover-over.png

507 ms

HelveticaNeueLTStd-Lt.woff

HelveticaNeueLTStd-Lt.woff

512 ms

HelveticaNeueLTStd-Th.woff

HelveticaNeueLTStd-Th.woff

532 ms

HelveticaNeueLTStd-Md.woff

HelveticaNeueLTStd-Md.woff

581 ms

HelveticaNeueLTStd-Roman.woff

HelveticaNeueLTStd-Roman.woff

590 ms

HelveticaNeueLTStd-LtIt.woff

HelveticaNeueLTStd-LtIt.woff

589 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

661 ms

analytics.js

analytics.js

180 ms

geo.php

geo.php

430 ms

csm_KELLER_minimal-windows_4925_b435641eff.jpg

csm_KELLER_minimal-windows_4925_b435641eff.jpg

608 ms

csm_KELLER_GLASSHOUSE_easy-roof_4816_98823c02f8.jpg

csm_KELLER_GLASSHOUSE_easy-roof_4816_98823c02f8.jpg

687 ms

csm_KELLER_Orangerie-Elegance_3909_7f727855cc.png

csm_KELLER_Orangerie-Elegance_3909_7f727855cc.png

1070 ms

csm_KELLER_Wintergarden_Imperial_2228_0fa507e223.png

csm_KELLER_Wintergarden_Imperial_2228_0fa507e223.png

957 ms

collect

collect

12 ms

collect

collect

54 ms

Accessibility Review

keller.lu accessibility score

88

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

Links do not have a discernible name

Best Practices

keller.lu best practices score

92

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

Page has valid source maps

SEO Factors

keller.lu SEO score

86

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

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

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 Keller.lu 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 Keller.lu 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

keller.lu

Open Graph data is detected on the main page of Keller. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: