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Report Summary

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    Performance

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    Accessibility

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    Best Practices

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    SEO

jsperf.com

jsPerf: JavaScript performance playground

Page Load Speed

1.1 sec in total

First Response

216 ms

Resources Loaded

627 ms

Page Rendered

216 ms

jsperf.com screenshot

About Website

Welcome to jsperf.com homepage info - get ready to check JsPerf best content for United States right away, or after learning these important things about jsperf.com

A performance playground for JavaScript developers. Easily create and share test cases and run cross-browser benchmarks to find out which code snippet is most efficient.

Visit jsperf.com

Key Findings

We analyzed Jsperf.com page load time and found that the first response time was 216 ms and then it took 843 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 15% of websites can load faster.

Performance Metrics

jsperf.com performance score

0

Network Requests Diagram

jsperf.com

216 ms

20150703.css

74 ms

carbon.js

70 ms

jquery.js

116 ms

main-20150701.js

33 ms

Our browser made a total of 19 requests to load all elements on the main page. We found that 16% of them (3 requests) were addressed to the original Jsperf.com, 21% (4 requests) were made to Gstatic.com and 21% (4 requests) were made to Google.com. The less responsive or slowest element that took the longest time to load (216 ms) belongs to the original domain Jsperf.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 207.4 kB (51%)

Content Size

407.3 kB

After Optimization

199.9 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Jsperf.com main page is 407.3 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. Javascripts take 245.7 kB which makes up the majority of the site volume.

HTML Optimization

-66%

Potential reduce by 5.7 kB

  • Original 8.7 kB
  • After minification 8.6 kB
  • After compression 3.0 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 5.7 kB or 66% of the original size.

Image Optimization

-27%

Potential reduce by 5.2 kB

  • Original 19.0 kB
  • After minification 13.9 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, JsPerf needs image optimization as it can save up to 5.2 kB or 27% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-62%

Potential reduce by 152.8 kB

  • Original 245.7 kB
  • After minification 245.6 kB
  • After compression 92.9 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 152.8 kB or 62% of the original size.

CSS Optimization

-33%

Potential reduce by 43.7 kB

  • Original 133.8 kB
  • After minification 133.7 kB
  • After compression 90.1 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. Jsperf.com needs all CSS files to be minified and compressed as it can save up to 43.7 kB or 33% of the original size.

Requests Breakdown

Number of requests can be reduced by 9 (56%)

Requests Now

16

After Optimization

7

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 16 CSS, Javascripts, AJAX and image requests in order to completely render the main page of JsPerf. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 10 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

jsperf.com

jsperf.com

216 ms

20150703.css

20150703.css

74 ms

carbon.js

carbon.js

70 ms

jquery.js

jquery.js

116 ms

main-20150701.js

main-20150701.js

33 ms

api.js

api.js

52 ms

C6AILKT.json

C6AILKT.json

175 ms

ga.js

ga.js

61 ms

recaptcha__en.js

recaptcha__en.js

96 ms

__utm.gif

__utm.gif

31 ms

anchor

anchor

35 ms

26849

26849

6 ms

styles__ltr.css

styles__ltr.css

17 ms

4EC4wLGK4y3SwAy3dIzwZHDBwf36V01jUijrRMUCPwQ.js

4EC4wLGK4y3SwAy3dIzwZHDBwf36V01jUijrRMUCPwQ.js

17 ms

webworker.js

webworker.js

21 ms

logo_48.png

logo_48.png

9 ms

zN7GBFwfMP4uA6AR0HCoLQ.ttf

zN7GBFwfMP4uA6AR0HCoLQ.ttf

67 ms

RxZJdnzeo3R5zSexge8UUaCWcynf_cDxXwCLxiixG1c.ttf

RxZJdnzeo3R5zSexge8UUaCWcynf_cDxXwCLxiixG1c.ttf

73 ms

recaptcha__en.js

recaptcha__en.js

20 ms

SEO Factors

jsperf.com SEO score

0

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 Jsperf.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 Jsperf.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

jsperf.com

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