Tools & Wizards About Us
histsci.fas.harvard.edu screenshot

Report Summary

  • 44

    Performance

    Renders faster than
    63% of other websites

  • 91

    Accessibility

    Visual factors better than
    that of 76% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 93

    SEO

    Google-friendlier than
    83% of websites

histsci.fas.harvard.edu

Department of the History of Science, Harvard University

Page Load Speed

2.3 sec in total

First Response

605 ms

Resources Loaded

1.5 sec

Page Rendered

199 ms

histsci.fas.harvard.edu screenshot

About Website

Visit histsci.fas.harvard.edu now to see the best up-to-date Histsci Fas Harvard content for United States and also check out these interesting facts you probably never knew about histsci.fas.harvard.edu

History of Science, physics, astronomy, molecular biology, evolutionary theory, technology, brain, behavioral science, medicine, public health, philosophy, technology, science, technology & society, A...

Visit histsci.fas.harvard.edu

Key Findings

We analyzed Histsci.fas.harvard.edu page load time and found that the first response time was 605 ms and then it took 1.7 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 35% of websites can load faster.

Performance Metrics

histsci.fas.harvard.edu performance score

44

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.1 s

45/100

10%

LCP (Largest Contentful Paint)

Value27.4 s

0/100

25%

SI (Speed Index)

Value8.9 s

15/100

10%

TBT (Total Blocking Time)

Value300 ms

78/100

30%

CLS (Cumulative Layout Shift)

Value0.078

95/100

15%

TTI (Time to Interactive)

Value17.4 s

4/100

10%

Network Requests Diagram

histsci.fas.harvard.edu

605 ms

js

68 ms

css_xE-rWrJf-fncB6ztZfd2huxqgxu4WO-qwma6Xer30m4.css

119 ms

css_It1s6A8aP62etHWwu5vdiJfrBJ2NzD9-Vm2UNwOvfrE.css

32 ms

css_zhoRXX72C1evmB7CJfdiuq9vivEEgGA5qj9uLSlL-FU.css

256 ms

Our browser made a total of 73 requests to load all elements on the main page. We found that 64% of them (47 requests) were addressed to the original Histsci.fas.harvard.edu, 22% (16 requests) were made to Fonts.gstatic.com and 3% (2 requests) were made to Cdnjs.cloudflare.com. The less responsive or slowest element that took the longest time to load (605 ms) belongs to the original domain Histsci.fas.harvard.edu.

Page Optimization Overview & Recommendations

Page size can be reduced by 401.5 kB (7%)

Content Size

5.4 MB

After Optimization

5.0 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Histsci.fas.harvard.edu main page is 5.4 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 80% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 4.9 MB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 60.4 kB

  • Original 77.6 kB
  • After minification 75.7 kB
  • After compression 17.2 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 60.4 kB or 78% of the original size.

Image Optimization

-1%

Potential reduce by 30.7 kB

  • Original 4.9 MB
  • After minification 4.9 MB

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. Histsci Fas Harvard images are well optimized though.

JavaScript Optimization

-67%

Potential reduce by 140.7 kB

  • Original 210.4 kB
  • After minification 171.9 kB
  • After compression 69.7 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 140.7 kB or 67% of the original size.

CSS Optimization

-79%

Potential reduce by 169.8 kB

  • Original 214.3 kB
  • After minification 208.8 kB
  • After compression 44.6 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. Histsci.fas.harvard.edu needs all CSS files to be minified and compressed as it can save up to 169.8 kB or 79% of the original size.

Requests Breakdown

Number of requests can be reduced by 24 (43%)

Requests Now

56

After Optimization

32

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 56 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Histsci Fas Harvard. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 16 to 1 for JavaScripts and from 10 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

histsci.fas.harvard.edu

histsci.fas.harvard.edu

605 ms

js

js

68 ms

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119 ms

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32 ms

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256 ms

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25 ms

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23 ms

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33 ms

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33 ms

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40 ms

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37 ms

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52 ms

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82 ms

MathJax.js

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334 ms

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163 ms

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79 ms

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79 ms

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81 ms

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95 ms

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31 ms

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124 ms

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60 ms

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363 ms

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67 ms

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286 ms

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14 ms

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45 ms

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102 ms

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Accessibility Review

histsci.fas.harvard.edu accessibility score

91

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.

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

Links do not have a discernible name

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Some elements have a [tabindex] value greater than 0

Best Practices

histsci.fas.harvard.edu 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

High

Browser errors were logged to the console

SEO Factors

histsci.fas.harvard.edu SEO score

93

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Links do not have descriptive text

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 Histsci.fas.harvard.edu 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 Histsci.fas.harvard.edu 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

histsci.fas.harvard.edu

Open Graph description is not detected on the main page of Histsci Fas 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: