Tools & Wizards About Us
zipcode.org screenshot

Report Summary

  • 87

    Performance

    Renders faster than
    90% of other websites

  • 93

    Accessibility

    Visual factors better than
    that of 82% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 79

    SEO

    Google-friendlier than
    40% of websites

zipcode.org

ZipCode.org - Zip Codes for USA

Page Load Speed

887 ms in total

First Response

149 ms

Resources Loaded

602 ms

Page Rendered

136 ms

zipcode.org screenshot

About Website

Welcome to zipcode.org homepage info - get ready to check Zip Code best content for Vietnam right away, or after learning these important things about zipcode.org

Zip Codes, Postal Codes, and Zip Code Maps for USA

Visit zipcode.org

Key Findings

We analyzed Zipcode.org page load time and found that the first response time was 149 ms and then it took 738 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 10% of websites can load faster.

Performance Metrics

zipcode.org performance score

87

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.6 s

64/100

10%

LCP (Largest Contentful Paint)

Value3.5 s

64/100

25%

SI (Speed Index)

Value2.6 s

97/100

10%

TBT (Total Blocking Time)

Value10 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.002

100/100

15%

TTI (Time to Interactive)

Value3.1 s

95/100

10%

Network Requests Diagram

zipcode.org

149 ms

stylesheet_20120906a.css

66 ms

jquery.js

232 ms

jquery-jvectormap-1.0.min.js

128 ms

jquery-jvectormap-us-aea-en.js

254 ms

Our browser made a total of 13 requests to load all elements on the main page. We found that 85% of them (11 requests) were addressed to the original Zipcode.org, 15% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (254 ms) belongs to the original domain Zipcode.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 280.8 kB (57%)

Content Size

491.2 kB

After Optimization

210.4 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Zipcode.org main page is 491.2 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 252.2 kB which makes up the majority of the site volume.

HTML Optimization

-69%

Potential reduce by 114.5 kB

  • Original 165.1 kB
  • After minification 159.5 kB
  • After compression 50.7 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 114.5 kB or 69% of the original size.

Image Optimization

-1%

Potential reduce by 830 B

  • Original 60.9 kB
  • After minification 60.1 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. Zip Code images are well optimized though.

JavaScript Optimization

-61%

Potential reduce by 154.9 kB

  • Original 252.2 kB
  • After minification 251.8 kB
  • After compression 97.3 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 154.9 kB or 61% of the original size.

CSS Optimization

-82%

Potential reduce by 10.6 kB

  • Original 12.9 kB
  • After minification 12.0 kB
  • After compression 2.3 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. Zipcode.org needs all CSS files to be minified and compressed as it can save up to 10.6 kB or 82% of the original size.

Requests Breakdown

Number of requests can be reduced by 3 (25%)

Requests Now

12

After Optimization

9

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 12 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Zip Code. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 4 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

zipcode.org

zipcode.org

149 ms

stylesheet_20120906a.css

stylesheet_20120906a.css

66 ms

jquery.js

jquery.js

232 ms

jquery-jvectormap-1.0.min.js

jquery-jvectormap-1.0.min.js

128 ms

jquery-jvectormap-us-aea-en.js

jquery-jvectormap-us-aea-en.js

254 ms

ga.js

ga.js

34 ms

header.jpg

header.jpg

128 ms

gradient-bar.jpg

gradient-bar.jpg

66 ms

jumpoff_bg.png

jumpoff_bg.png

190 ms

footer_logo.gif

footer_logo.gif

69 ms

ajax_actions.cfm

ajax_actions.cfm

163 ms

ajax_actions.cfm

ajax_actions.cfm

145 ms

__utm.gif

__utm.gif

26 ms

Accessibility Review

zipcode.org accessibility score

93

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.

Best Practices

zipcode.org 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

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

zipcode.org SEO score

79

Search Engine Optimization Advices

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 Zipcode.org 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 Zipcode.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

zipcode.org

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