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charts.noaa.gov screenshot

Report Summary

  • 100

    Performance

    Renders faster than
    97% of other websites

  • 89

    Accessibility

    Visual factors better than
    that of 72% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 64

    SEO

    Google-friendlier than
    24% of websites

charts.noaa.gov

Quick Links

Page Load Speed

802 ms in total

First Response

72 ms

Resources Loaded

599 ms

Page Rendered

131 ms

charts.noaa.gov screenshot

About Website

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Key Findings

We analyzed Charts.noaa.gov page load time and found that the first response time was 72 ms and then it took 730 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

charts.noaa.gov performance score

100

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.1 s

99/100

10%

LCP (Largest Contentful Paint)

Value1.1 s

100/100

25%

SI (Speed Index)

Value1.1 s

100/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value1.1 s

100/100

10%

Network Requests Diagram

charts.noaa.gov

72 ms

ocs.css

106 ms

lightbox.css

10 ms

ocs.css

212 ms

transparency.gif

9 ms

Our browser made a total of 15 requests to load all elements on the main page. We found that 33% of them (5 requests) were addressed to the original Charts.noaa.gov, 53% (8 requests) were made to Nauticalcharts.noaa.gov and 13% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (212 ms) relates to the external source Nauticalcharts.noaa.gov.

Page Optimization Overview & Recommendations

Page size can be reduced by 34.6 kB (26%)

Content Size

134.4 kB

After Optimization

99.8 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Charts.noaa.gov main page is 134.4 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. 20% of websites need less resources to load. Images take 80.1 kB which makes up the majority of the site volume.

HTML Optimization

-69%

Potential reduce by 6.9 kB

  • Original 10.0 kB
  • After minification 9.5 kB
  • After compression 3.1 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 6.9 kB or 69% of the original size.

Image Optimization

-4%

Potential reduce by 3.1 kB

  • Original 80.1 kB
  • After minification 77.0 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. Charts Noaa images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 34 B

  • Original 17.2 kB
  • After minification 17.2 kB
  • After compression 17.1 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

-90%

Potential reduce by 24.5 kB

  • Original 27.1 kB
  • After minification 17.3 kB
  • After compression 2.6 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. Charts.noaa.gov needs all CSS files to be minified and compressed as it can save up to 24.5 kB or 90% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

9

After Optimization

9

  • Images
  • JavaScript
  • CSS

The browser has sent 9 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Charts Noaa. According to our analytics all requests are already optimized.

Network Requests Diagram

charts.noaa.gov

charts.noaa.gov

72 ms

ocs.css

ocs.css

106 ms

lightbox.css

lightbox.css

10 ms

ocs.css

ocs.css

212 ms

transparency.gif

transparency.gif

9 ms

RNC.JPG

RNC.JPG

49 ms

ENC.JPG

ENC.JPG

48 ms

CAT.JPG

CAT.JPG

47 ms

ga.js

ga.js

8 ms

transparency.gif

transparency.gif

44 ms

OCS-subpage-art.gif

OCS-subpage-art.gif

16 ms

__utm.gif

__utm.gif

13 ms

bottom-wave-bar.gif

bottom-wave-bar.gif

10 ms

OCS-subpage-art.gif

OCS-subpage-art.gif

158 ms

bottom-wave-bar.gif

bottom-wave-bar.gif

110 ms

Accessibility Review

charts.noaa.gov accessibility score

89

Accessibility Issues

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

Best Practices

charts.noaa.gov best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

SEO Factors

charts.noaa.gov SEO score

64

Search Engine Optimization Advices

Language and Encoding

  • Language Detected

    N/A

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Charts.noaa.gov can be misinterpreted by Google and other search engines. Unfortunately we cannot identify language used on the page (probably there is a mix of languages, too little text or something else) and no language is claimed in <html> or <meta> tags either. Our system also found out that Charts.noaa.gov 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

charts.noaa.gov

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