Tools & Wizards About Us
dc.postcodebase.com screenshot

Report Summary

  • 48

    Performance

    Renders faster than
    66% of other websites

  • 98

    Accessibility

    Visual factors better than
    that of 94% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 93

    SEO

    Google-friendlier than
    83% of websites

dc.postcodebase.com

Home | District Of Columbia United States ZIP Code 5 Plus 4 ✉️

Page Load Speed

1.2 sec in total

First Response

125 ms

Resources Loaded

525 ms

Page Rendered

522 ms

dc.postcodebase.com screenshot

About Website

Visit dc.postcodebase.com now to see the best up-to-date Dc Post Code Base content for United States and also check out these interesting facts you probably never knew about dc.postcodebase.com

This is the District Of Columbia ZIP code website, which contains 297 ZIP codes, 6 cities, 1 counties, and more than 81,533 ZIP+4 codes. Each 9-digit ZIP code corresponds to one or several District Of...

Visit dc.postcodebase.com

Key Findings

We analyzed Dc.postcodebase.com page load time and found that the first response time was 125 ms and then it took 1 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 20% of websites can load faster.

Performance Metrics

dc.postcodebase.com performance score

48

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.9 s

87/100

10%

LCP (Largest Contentful Paint)

Value1.9 s

98/100

25%

SI (Speed Index)

Value16.1 s

0/100

10%

TBT (Total Blocking Time)

Value11,150 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.009

100/100

15%

TTI (Time to Interactive)

Value50.6 s

0/100

10%

Network Requests Diagram

dc.postcodebase.com

125 ms

dc.postcodebase.com

50 ms

style.css

28 ms

cls.css

59 ms

pubfig.min.js

87 ms

Our browser made a total of 39 requests to load all elements on the main page. We found that 28% of them (11 requests) were addressed to the original Dc.postcodebase.com, 59% (23 requests) were made to Zip.postcodebase.com and 5% (2 requests) were made to A.pub.network. The less responsive or slowest element that took the longest time to load (239 ms) belongs to the original domain Dc.postcodebase.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 158.2 kB (32%)

Content Size

493.7 kB

After Optimization

335.6 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Dc.postcodebase.com main page is 493.7 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. 40% of websites need less resources to load. Javascripts take 254.8 kB which makes up the majority of the site volume.

HTML Optimization

-82%

Potential reduce by 35.1 kB

  • Original 42.6 kB
  • After minification 32.6 kB
  • After compression 7.5 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 10.0 kB, which is 24% 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 35.1 kB or 82% of the original size.

Image Optimization

-0%

Potential reduce by 0 B

  • Original 184.1 kB
  • After minification 184.1 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. Dc Post Code Base images are well optimized though.

JavaScript Optimization

-48%

Potential reduce by 122.9 kB

  • Original 254.8 kB
  • After minification 254.8 kB
  • After compression 131.8 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 122.9 kB or 48% of the original size.

CSS Optimization

-1%

Potential reduce by 105 B

  • Original 12.2 kB
  • After minification 12.2 kB
  • After compression 12.1 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. Dc.postcodebase.com has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 24 (65%)

Requests Now

37

After Optimization

13

  • Images
  • JavaScript
  • CSS

The browser has sent 37 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Dc Post Code Base. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 7 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

dc.postcodebase.com

dc.postcodebase.com

125 ms

dc.postcodebase.com

dc.postcodebase.com

50 ms

style.css

style.css

28 ms

cls.css

cls.css

59 ms

pubfig.min.js

pubfig.min.js

87 ms

js

js

88 ms

adsbygoogle.js

adsbygoogle.js

235 ms

clipboard.min.js

clipboard.min.js

84 ms

rocket-loader.min.js

rocket-loader.min.js

33 ms

vcd15cbe7772f49c399c6a5babf22c1241717689176015

vcd15cbe7772f49c399c6a5babf22c1241717689176015

96 ms

img_logo.png

img_logo.png

26 ms

bg_img.jpg

bg_img.jpg

25 ms

dc.jpg

dc.jpg

30 ms

right.svg

right.svg

29 ms

dc.png

dc.png

239 ms

homepage.png

homepage.png

127 ms

img_nav.png

img_nav.png

24 ms

lang-switch.png

lang-switch.png

28 ms

img_close.png

img_close.png

35 ms

img_logo.png

img_logo.png

41 ms

usa_zip.png

usa_zip.png

36 ms

icon_random_address.svg

icon_random_address.svg

51 ms

icon_query.svg

icon_query.svg

43 ms

icon_zip_addfour.svg

icon_zip_addfour.svg

52 ms

icon_zipcode_distance.svg

icon_zipcode_distance.svg

53 ms

icon_datas.png

icon_datas.png

50 ms

img_city.png

img_city.png

90 ms

img_arrow_right.png

img_arrow_right.png

65 ms

img_county.png

img_county.png

74 ms

img_postcode.png

img_postcode.png

77 ms

img_envelope.png

img_envelope.png

67 ms

usa.jpg

usa.jpg

74 ms

img_population.png

img_population.png

91 ms

shopping-cart.png

shopping-cart.png

83 ms

datas-img.png

datas-img.png

96 ms

img_state.png

img_state.png

91 ms

img_footer_logo.png

img_footer_logo.png

107 ms

img_return_top.png

img_return_top.png

100 ms

js_YD9ro0PAqY25gGWrTki6TjRUG8TdokmmxjfqpNNfzVU.js

js_YD9ro0PAqY25gGWrTki6TjRUG8TdokmmxjfqpNNfzVU.js

23 ms

Accessibility Review

dc.postcodebase.com accessibility score

98

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

dc.postcodebase.com best practices score

75

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

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

SEO Factors

dc.postcodebase.com SEO score

93

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

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 Dc.postcodebase.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 Dc.postcodebase.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

dc.postcodebase.com

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