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centennialbulb.org screenshot

Report Summary

  • 97

    Performance

    Renders faster than
    94% of other websites

  • 71

    Accessibility

    Visual factors better than
    that of 36% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 50

    SEO

    Google-friendlier than
    18% of websites

centennialbulb.org

Livermore's Centennial Light Bulb

Page Load Speed

2.6 sec in total

First Response

282 ms

Resources Loaded

1.7 sec

Page Rendered

597 ms

centennialbulb.org screenshot

About Website

Welcome to centennialbulb.org homepage info - get ready to check Centennial Bulb best content for Turkey right away, or after learning these important things about centennialbulb.org

You have found Livermore California's World famous Centennial Light Bulb! Feel free to read the facts sheet, take a close-up look at bulb photos, tour Station #6, of our downtown of 1901. Learn about ...

Visit centennialbulb.org

Key Findings

We analyzed Centennialbulb.org page load time and found that the first response time was 282 ms and then it took 2.3 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

centennialbulb.org performance score

97

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value0.8 s

100/100

10%

LCP (Largest Contentful Paint)

Value1.8 s

98/100

25%

SI (Speed Index)

Value0.8 s

100/100

10%

TBT (Total Blocking Time)

Value150 ms

95/100

30%

CLS (Cumulative Layout Shift)

Value0.052

99/100

15%

TTI (Time to Interactive)

Value3.4 s

93/100

10%

Network Requests Diagram

centennialbulb.org

282 ms

local.css

111 ms

element.js

48 ms

SimpleNavBarStyles.css

119 ms

SimpleNavBarScripts.js

163 ms

Our browser made a total of 37 requests to load all elements on the main page. We found that 81% of them (30 requests) were addressed to the original Centennialbulb.org, 11% (4 requests) were made to Translate.googleapis.com and 5% (2 requests) were made to Gstatic.com. The less responsive or slowest element that took the longest time to load (1.4 sec) belongs to the original domain Centennialbulb.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 268.4 kB (27%)

Content Size

976.5 kB

After Optimization

708.1 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Centennialbulb.org main page is 976.5 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 15% of websites need less resources to load. Images take 845.8 kB which makes up the majority of the site volume.

HTML Optimization

-75%

Potential reduce by 28.6 kB

  • Original 37.9 kB
  • After minification 34.7 kB
  • After compression 9.3 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 28.6 kB or 75% of the original size.

Image Optimization

-28%

Potential reduce by 233.6 kB

  • Original 845.8 kB
  • After minification 612.3 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. Obviously, Centennial Bulb needs image optimization as it can save up to 233.6 kB or 28% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-2%

Potential reduce by 1.5 kB

  • Original 83.5 kB
  • After minification 82.9 kB
  • After compression 82.0 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. This website has mostly compressed JavaScripts.

CSS Optimization

-52%

Potential reduce by 4.8 kB

  • Original 9.2 kB
  • After minification 6.2 kB
  • After compression 4.4 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. Centennialbulb.org needs all CSS files to be minified and compressed as it can save up to 4.8 kB or 52% of the original size.

Requests Breakdown

Number of requests can be reduced by 4 (11%)

Requests Now

36

After Optimization

32

  • Images
  • JavaScript
  • CSS

The browser has sent 36 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Centennial Bulb. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

centennialbulb.org

centennialbulb.org

282 ms

local.css

local.css

111 ms

element.js

element.js

48 ms

SimpleNavBarStyles.css

SimpleNavBarStyles.css

119 ms

SimpleNavBarScripts.js

SimpleNavBarScripts.js

163 ms

liv-ca.gif

liv-ca.gif

191 ms

cltitle.gif

cltitle.gif

325 ms

cb11s.jpg

cb11s.jpg

363 ms

longest.gif

longest.gif

326 ms

ctbulb.jpg

ctbulb.jpg

369 ms

cb3s.jpg

cb3s.jpg

481 ms

translateelement.css

translateelement.css

63 ms

main.js

main.js

76 ms

ltbulbg7.jpg

ltbulbg7.jpg

400 ms

title2.jpg

title2.jpg

657 ms

JMarchand1_pp_2.jpg

JMarchand1_pp_2.jpg

433 ms

1mil-parade-ws.jpg

1mil-parade-ws.jpg

629 ms

tom-book-s.jpg

tom-book-s.jpg

575 ms

bulb-fair-s.jpg

bulb-fair-s.jpg

731 ms

ctb-bulbrite-s.jpg

ctb-bulbrite-s.jpg

653 ms

fhl-cover-s.jpg

fhl-cover-s.jpg

795 ms

toms-book-s.jpg

toms-book-s.jpg

827 ms

book-frnt-s.jpg

book-frnt-s.jpg

944 ms

poster-o.jpg

poster-o.jpg

973 ms

comittes.jpg

comittes.jpg

1166 ms

century-light-s.jpg

century-light-s.jpg

1048 ms

fhb15s.jpg

fhb15s.jpg

1161 ms

lb1.jpg

lb1.jpg

1040 ms

liv-logo.jpg

liv-logo.jpg

1227 ms

hosecl.gif

hosecl.gif

1254 ms

3Demail2.gif

3Demail2.gif

1120 ms

LtBulbg4w.jpg

LtBulbg4w.jpg

1226 ms

LtBulbg4.jpg

LtBulbg4.jpg

1404 ms

element_main.js

element_main.js

39 ms

translate_24dp.png

translate_24dp.png

52 ms

l

l

38 ms

googlelogo_color_42x16dp.png

googlelogo_color_42x16dp.png

53 ms

Accessibility Review

centennialbulb.org accessibility score

71

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

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

High

List items (<li>) are not contained within <ul> or <ol> parent elements.

Best Practices

centennialbulb.org best practices score

67

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

SEO Factors

centennialbulb.org SEO score

50

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

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Centennialbulb.org 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 Centennialbulb.org 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

centennialbulb.org

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