Tools & Wizards About Us
mastering-ros.com screenshot

Report Summary

  • 46

    Performance

    Renders faster than
    64% of other websites

  • 87

    Accessibility

    Visual factors better than
    that of 66% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 90

    SEO

    Google-friendlier than
    68% of websites

mastering-ros.com

Mastering ROS for Robotics Programming

Page Load Speed

1.9 sec in total

First Response

31 ms

Resources Loaded

1.2 sec

Page Rendered

647 ms

mastering-ros.com screenshot

About Website

Click here to check amazing Mastering ROS content. Otherwise, check out these important facts you probably never knew about mastering-ros.com

Master your skills in Robot Operating System

Visit mastering-ros.com

Key Findings

We analyzed Mastering-ros.com page load time and found that the first response time was 31 ms and then it took 1.9 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 40% of websites can load faster.

Performance Metrics

mastering-ros.com performance score

46

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.5 s

67/100

10%

LCP (Largest Contentful Paint)

Value3.1 s

76/100

25%

SI (Speed Index)

Value6.8 s

34/100

10%

TBT (Total Blocking Time)

Value2,520 ms

4/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value19.1 s

3/100

10%

Network Requests Diagram

mastering-ros.com

31 ms

mastering-ros.com

52 ms

css

25 ms

css

45 ms

bootstrap.css

29 ms

Our browser made a total of 69 requests to load all elements on the main page. We found that 52% of them (36 requests) were addressed to the original Mastering-ros.com, 14% (10 requests) were made to Fonts.gstatic.com and 7% (5 requests) were made to Youtube.com. The less responsive or slowest element that took the longest time to load (469 ms) relates to the external source Syndication.twitter.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 410.0 kB (12%)

Content Size

3.5 MB

After Optimization

3.0 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Mastering-ros.com main page is 3.5 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. Only a small number of websites need less resources to load. Images take 2.9 MB which makes up the majority of the site volume.

HTML Optimization

-86%

Potential reduce by 103.4 kB

  • Original 119.6 kB
  • After minification 82.6 kB
  • After compression 16.2 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 37.1 kB, which is 31% 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 103.4 kB or 86% of the original size.

Image Optimization

-10%

Potential reduce by 303.9 kB

  • Original 2.9 MB
  • After minification 2.6 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. Mastering ROS images are well optimized though.

JavaScript Optimization

-1%

Potential reduce by 2.6 kB

  • Original 356.5 kB
  • After minification 356.5 kB
  • After compression 353.9 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

-0%

Potential reduce by 0 B

  • Original 61.4 kB
  • After minification 61.4 kB
  • After compression 61.4 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. Mastering-ros.com has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 29 (55%)

Requests Now

53

After Optimization

24

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 53 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Mastering ROS. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 22 to 1 for JavaScripts and from 9 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

mastering-ros.com

mastering-ros.com

31 ms

mastering-ros.com

mastering-ros.com

52 ms

css

css

25 ms

css

css

45 ms

bootstrap.css

bootstrap.css

29 ms

font-awesome.css

font-awesome.css

38 ms

animations.css

animations.css

25 ms

style.css

style.css

25 ms

half-slider.css

half-slider.css

42 ms

jquery.min.js

jquery.min.js

39 ms

bootstrap.min.js

bootstrap.min.js

40 ms

modernizr.js

modernizr.js

46 ms

isotope.pkgd.min.js

isotope.pkgd.min.js

49 ms

jquery.backstretch.min.js

jquery.backstretch.min.js

43 ms

jquery.appear.js

jquery.appear.js

46 ms

template.js

template.js

49 ms

custom.js

custom.js

54 ms

jqBootstrapValidation.js

jqBootstrapValidation.js

64 ms

contact_me.js

contact_me.js

57 ms

in.js

in.js

35 ms

addthis_widget.js

addthis_widget.js

34 ms

animate.css

animate.css

52 ms

v2.zopim.com

v2.zopim.com

249 ms

analytics.js

analytics.js

211 ms

HijytlG1ICQ

HijytlG1ICQ

342 ms

sdk.js

sdk.js

195 ms

widgets.js

widgets.js

197 ms

banner.jpg

banner.jpg

103 ms

1.jpg

1.jpg

106 ms

bg-image-1.jpg

bg-image-1.jpg

91 ms

2.jpg

2.jpg

107 ms

portfolio-1.jpg

portfolio-1.jpg

105 ms

portfolio-2.jpg

portfolio-2.jpg

104 ms

portfolio-3.jpg

portfolio-3.jpg

153 ms

portfolio-4.jpg

portfolio-4.jpg

155 ms

portfolio-5.jpg

portfolio-5.jpg

152 ms

portfolio-6.jpg

portfolio-6.jpg

153 ms

portfolio-7.jpg

portfolio-7.jpg

155 ms

portfolio-8.jpg

portfolio-8.jpg

163 ms

portfolio-9.jpg

portfolio-9.jpg

204 ms

portfolio-10.jpg

portfolio-10.jpg

229 ms

portfolio-11.jpg

portfolio-11.jpg

460 ms

portfolio-12.jpg

portfolio-12.jpg

260 ms

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memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4uaVc.ttf

17 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsiH0B4uaVc.ttf

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsiH0B4uaVc.ttf

55 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsg-1x4uaVc.ttf

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsg-1x4uaVc.ttf

63 ms

memQYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWq8tWZ0Pw86hd0Rk8ZkWV4exQ.ttf

memQYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWq8tWZ0Pw86hd0Rk8ZkWV4exQ.ttf

89 ms

memQYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWq8tWZ0Pw86hd0RkyFjWV4exQ.ttf

memQYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWq8tWZ0Pw86hd0RkyFjWV4exQ.ttf

87 ms

glyphicons-halflings-regular.woff

glyphicons-halflings-regular.woff

227 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

228 ms

1Ptxg8zYS_SKggPN4iEgvnHyvveLxVs9pbCIPrQ.ttf

1Ptxg8zYS_SKggPN4iEgvnHyvveLxVs9pbCIPrQ.ttf

88 ms

1Ptxg8zYS_SKggPN4iEgvnHyvveLxVvaorCIPrQ.ttf

1Ptxg8zYS_SKggPN4iEgvnHyvveLxVvaorCIPrQ.ttf

88 ms

1Ptxg8zYS_SKggPN4iEgvnHyvveLxVuEorCIPrQ.ttf

1Ptxg8zYS_SKggPN4iEgvnHyvveLxVuEorCIPrQ.ttf

89 ms

collect

collect

93 ms

asset_composer.js

asset_composer.js

147 ms

sdk.js

sdk.js

78 ms

widget_iframe.2f70fb173b9000da126c79afe2098f02.html

widget_iframe.2f70fb173b9000da126c79afe2098f02.html

60 ms

www-player.css

www-player.css

35 ms

js

js

315 ms

www-embed-player.js

www-embed-player.js

80 ms

base.js

base.js

127 ms

settings

settings

469 ms

ad_status.js

ad_status.js

218 ms

bNcI7UjXjnJFAMIAjw9BFdG_qFxAD_uleT7D3Wz_WuI.js

bNcI7UjXjnJFAMIAjw9BFdG_qFxAD_uleT7D3Wz_WuI.js

177 ms

embed.js

embed.js

79 ms

id

id

38 ms

KFOmCnqEu92Fr1Mu4mxP.ttf

KFOmCnqEu92Fr1Mu4mxP.ttf

46 ms

KFOlCnqEu92Fr1MmEU9fBBc9.ttf

KFOlCnqEu92Fr1MmEU9fBBc9.ttf

51 ms

Create

Create

166 ms

Accessibility Review

mastering-ros.com accessibility score

87

Accessibility Issues

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.

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

<frame> or <iframe> elements do not have a title

High

Links do not have a discernible name

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

mastering-ros.com best practices score

67

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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

mastering-ros.com SEO score

90

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

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 Mastering-ros.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 Mastering-ros.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

mastering-ros.com

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