Tools & Wizards About Us
zdoubleb.com screenshot

Report Summary

  • 26

    Performance

    Renders faster than
    45% of other websites

  • 89

    Accessibility

    Visual factors better than
    that of 71% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 98

    SEO

    Google-friendlier than
    92% of websites

zdoubleb.com

Denver Windows, Doors, Siding| Z Double B Inc. | Lakewood, CO

Page Load Speed

1.8 sec in total

First Response

75 ms

Resources Loaded

1.7 sec

Page Rendered

60 ms

zdoubleb.com screenshot

About Website

Welcome to zdoubleb.com homepage info - get ready to check Z Double B best content right away, or after learning these important things about zdoubleb.com

Z Double B Inc. is a full-service window replacement, siding, and door installation company in Lakewood, CO serving clients in the Denver Metro area since 2013.

Visit zdoubleb.com

Key Findings

We analyzed Zdoubleb.com page load time and found that the first response time was 75 ms and then it took 1.8 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 35% of websites can load faster.

Performance Metrics

zdoubleb.com performance score

26

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.7 s

61/100

10%

LCP (Largest Contentful Paint)

Value7.9 s

3/100

25%

SI (Speed Index)

Value9.6 s

11/100

10%

TBT (Total Blocking Time)

Value1,800 ms

9/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value20.3 s

2/100

10%

Network Requests Diagram

www.zdoubleb.com

75 ms

minified.js

32 ms

focus-within-polyfill.js

31 ms

polyfill.min.js

773 ms

js

70 ms

Our browser made a total of 48 requests to load all elements on the main page. We found that 2% of them (1 request) were addressed to the original Zdoubleb.com, 33% (16 requests) were made to Static.parastorage.com and 25% (12 requests) were made to Sentry-next.wixpress.com. The less responsive or slowest element that took the longest time to load (773 ms) relates to the external source Polyfill-fastly.io.

Page Optimization Overview & Recommendations

Page size can be reduced by 709.1 kB (61%)

Content Size

1.2 MB

After Optimization

457.4 kB

  • HTML
  • Images
  • JavaScript

In fact, the total size of Zdoubleb.com main page is 1.2 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. 50% of websites need less resources to load. HTML takes 607.9 kB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 475.6 kB

  • Original 607.9 kB
  • After minification 606.0 kB
  • After compression 132.3 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 475.6 kB or 78% of the original size.

Image Optimization

-7%

Potential reduce by 4.7 kB

  • Original 68.9 kB
  • After minification 64.3 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. Z Double B images are well optimized though.

JavaScript Optimization

-47%

Potential reduce by 228.9 kB

  • Original 489.7 kB
  • After minification 489.7 kB
  • After compression 260.8 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 228.9 kB or 47% of the original size.

Requests Breakdown

Number of requests can be reduced by 13 (30%)

Requests Now

43

After Optimization

30

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 43 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Z Double B. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 14 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

www.zdoubleb.com

www.zdoubleb.com

75 ms

minified.js

minified.js

32 ms

focus-within-polyfill.js

focus-within-polyfill.js

31 ms

polyfill.min.js

polyfill.min.js

773 ms

js

js

70 ms

thunderbolt-commons.5f3ef9f8.bundle.min.js

thunderbolt-commons.5f3ef9f8.bundle.min.js

46 ms

main.055801ac.bundle.min.js

main.055801ac.bundle.min.js

49 ms

main.renderer.1d21f023.bundle.min.js

main.renderer.1d21f023.bundle.min.js

46 ms

lodash.min.js

lodash.min.js

47 ms

react.production.min.js

react.production.min.js

47 ms

react-dom.production.min.js

react-dom.production.min.js

47 ms

siteTags.bundle.min.js

siteTags.bundle.min.js

46 ms

ZB2%20logo%20_png.png

ZB2%20logo%20_png.png

257 ms

a95c4a_68d3bf42f2074d109c653139f5f39e83~mv2.jpg

a95c4a_68d3bf42f2074d109c653139f5f39e83~mv2.jpg

424 ms

prime%20logo.png

prime%20logo.png

442 ms

sierra%20logo.png

sierra%20logo.png

401 ms

Milgard_WD_Logo-RGB_PNG-HR_color%20(1).png

Milgard_WD_Logo-RGB_PNG-HR_color%20(1).png

394 ms

Panda%20Logo%20-%20Black.png

Panda%20Logo%20-%20Black.png

443 ms

Simonton_PrimaryLogo_Inline_RGB_Gradient_0822-1.png

Simonton_PrimaryLogo_Inline_RGB_Gradient_0822-1.png

456 ms

yelp-reviews_button.png

yelp-reviews_button.png

654 ms

fb464d0a8fc5b55e9d301888d0aa4193.png

fb464d0a8fc5b55e9d301888d0aa4193.png

728 ms

1year_pdf.jpg

1year_pdf.jpg

606 ms

milgard-dealer.png

milgard-dealer.png

662 ms

121 ms

117 ms

bundle.min.js

bundle.min.js

79 ms

c6f5bcd6-66fc-44af-be95-bb1f2b38d080.woff

c6f5bcd6-66fc-44af-be95-bb1f2b38d080.woff

40 ms

41280d6d-9240-4d82-9e98-3ea1a1913501.woff

41280d6d-9240-4d82-9e98-3ea1a1913501.woff

38 ms

908c4810-64db-4b46-bb8e-823eb41f68c0.woff

908c4810-64db-4b46-bb8e-823eb41f68c0.woff

38 ms

cacc0862-f146-4746-92b1-60e6114a66c4.woff

cacc0862-f146-4746-92b1-60e6114a66c4.woff

38 ms

96 ms

94 ms

91 ms

91 ms

91 ms

90 ms

129 ms

126 ms

125 ms

125 ms

122 ms

122 ms

28 ms

34 ms

deprecation-en.v5.html

deprecation-en.v5.html

6 ms

bolt-performance

bolt-performance

19 ms

deprecation-style.v5.css

deprecation-style.v5.css

8 ms

right-arrow.svg

right-arrow.svg

6 ms

Accessibility Review

zdoubleb.com accessibility score

89

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

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

Best Practices

zdoubleb.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

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

zdoubleb.com SEO score

98

Search Engine Optimization Advices

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 Zdoubleb.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 Zdoubleb.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

zdoubleb.com

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