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tdc-www.harvard.edu screenshot

Report Summary

  • 98

    Performance

    Renders faster than
    95% of other websites

  • 61

    Accessibility

    Visual factors better than
    that of 27% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 69

    SEO

    Google-friendlier than
    28% of websites

tdc-www.harvard.edu

SAO Telescope Data Center

Page Load Speed

585 ms in total

First Response

147 ms

Resources Loaded

279 ms

Page Rendered

159 ms

tdc-www.harvard.edu screenshot

About Website

Welcome to tdc-www.harvard.edu homepage info - get ready to check Tdc Www Harvard best content for United States right away, or after learning these important things about tdc-www.harvard.edu

The SAO Telescope Data Center processes and archives data from the optical telescopes of the Harvard Smithsonian Center for Astrophysics.

Visit tdc-www.harvard.edu

Key Findings

We analyzed Tdc-www.harvard.edu page load time and found that the first response time was 147 ms and then it took 438 ms to load all DOM resources and completely render a web page. This is an excellent result, as only 5% of websites can load faster.

Performance Metrics

tdc-www.harvard.edu performance score

98

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.1 s

100/100

10%

LCP (Largest Contentful Paint)

Value1.4 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)

Value0.106

88/100

15%

TTI (Time to Interactive)

Value1.2 s

100/100

10%

Network Requests Diagram

tdc-www.harvard.edu

147 ms

cfastyles.css

51 ms

urchin.js

7 ms

__utm.gif

5 ms

sao-banner1b.gif

22 ms

Our browser made a total of 10 requests to load all elements on the main page. We found that 80% of them (8 requests) were addressed to the original Tdc-www.harvard.edu, 20% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (147 ms) belongs to the original domain Tdc-www.harvard.edu.

Page Optimization Overview & Recommendations

Page size can be reduced by 33.7 kB (62%)

Content Size

54.2 kB

After Optimization

20.5 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Tdc-www.harvard.edu main page is 54.2 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. Only 5% of websites need less resources to load. CSS take 25.4 kB which makes up the majority of the site volume.

HTML Optimization

-70%

Potential reduce by 9.5 kB

  • Original 13.5 kB
  • After minification 12.6 kB
  • After compression 4.0 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 9.5 kB or 70% of the original size.

Image Optimization

-0%

Potential reduce by 40 B

  • Original 8.4 kB
  • After minification 8.4 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. Tdc Www Harvard images are well optimized though.

JavaScript Optimization

-14%

Potential reduce by 971 B

  • Original 6.8 kB
  • After minification 6.8 kB
  • After compression 5.9 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 971 B or 14% of the original size.

CSS Optimization

-91%

Potential reduce by 23.2 kB

  • Original 25.4 kB
  • After minification 18.5 kB
  • After compression 2.2 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. Tdc-www.harvard.edu needs all CSS files to be minified and compressed as it can save up to 23.2 kB or 91% 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 Tdc Www Harvard. According to our analytics all requests are already optimized.

Network Requests Diagram

tdc-www.harvard.edu

tdc-www.harvard.edu

147 ms

cfastyles.css

cfastyles.css

51 ms

urchin.js

urchin.js

7 ms

__utm.gif

__utm.gif

5 ms

sao-banner1b.gif

sao-banner1b.gif

22 ms

sao-tdc-banner2b.gif

sao-tdc-banner2b.gif

33 ms

navbullet.gif

navbullet.gif

34 ms

navbullet2.gif

navbullet2.gif

34 ms

swirc.jpg

swirc.jpg

52 ms

footer-si.gif

footer-si.gif

35 ms

Accessibility Review

tdc-www.harvard.edu accessibility score

61

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.

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

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

Form elements do not have associated labels

High

Links do not have a discernible name

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

Best Practices

tdc-www.harvard.edu 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

SEO Factors

tdc-www.harvard.edu SEO score

69

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

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Tdc-www.harvard.edu can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Tdc-www.harvard.edu main page’s claimed encoding is iso-8859-1. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

tdc-www.harvard.edu

Open Graph description is not detected on the main page of Tdc Www Harvard. 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: