Tools & Wizards About Us

Report Summary

  • 97

    Performance

    Renders faster than
    94% of other websites

  • 71

    Accessibility

    Visual factors better than
    that of 36% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 75

    SEO

    Google-friendlier than
    32% of websites

haltonarp.com

Halton Arp's official website

Page Load Speed

1.9 sec in total

First Response

349 ms

Resources Loaded

1.5 sec

Page Rendered

133 ms

About Website

Click here to check amazing Halton Arp content. Otherwise, check out these important facts you probably never knew about haltonarp.com

Official website of astrophysicist Halton C. Arp - online publication of his scientific works.

Visit haltonarp.com

Key Findings

We analyzed Haltonarp.com page load time and found that the first response time was 349 ms and then it took 1.6 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

haltonarp.com performance score

97

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.4 s

97/100

10%

LCP (Largest Contentful Paint)

Value1.8 s

99/100

25%

SI (Speed Index)

Value1.9 s

100/100

10%

TBT (Total Blocking Time)

Value120 ms

97/100

30%

CLS (Cumulative Layout Shift)

Value0.09

92/100

15%

TTI (Time to Interactive)

Value2.5 s

98/100

10%

Network Requests Diagram

haltonarp.com

349 ms

www.haltonarp.com

331 ms

news.css

189 ms

website.js

198 ms

website.css

189 ms

Our browser made a total of 15 requests to load all elements on the main page. We found that 87% of them (13 requests) were addressed to the original Haltonarp.com, 13% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (349 ms) belongs to the original domain Haltonarp.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 13.0 kB (34%)

Content Size

38.5 kB

After Optimization

25.5 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Haltonarp.com main page is 38.5 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 10% of websites need less resources to load. Javascripts take 21.8 kB which makes up the majority of the site volume.

HTML Optimization

-58%

Potential reduce by 2.2 kB

  • Original 3.8 kB
  • After minification 3.8 kB
  • After compression 1.6 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 2.2 kB or 58% of the original size.

Image Optimization

-2%

Potential reduce by 82 B

  • Original 3.7 kB
  • After minification 3.6 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. Halton Arp images are well optimized though.

JavaScript Optimization

-17%

Potential reduce by 3.6 kB

  • Original 21.8 kB
  • After minification 20.7 kB
  • After compression 18.2 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 3.6 kB or 17% of the original size.

CSS Optimization

-77%

Potential reduce by 7.1 kB

  • Original 9.2 kB
  • After minification 4.7 kB
  • After compression 2.1 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. Haltonarp.com needs all CSS files to be minified and compressed as it can save up to 7.1 kB or 77% of the original size.

Requests Breakdown

Number of requests can be reduced by 5 (38%)

Requests Now

13

After Optimization

8

  • Images
  • JavaScript
  • CSS

The browser has sent 13 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Halton Arp. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 6 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

haltonarp.com accessibility score

71

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

Best Practices

haltonarp.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

SEO Factors

haltonarp.com SEO score

75

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 Haltonarp.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 Haltonarp.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

Open Graph description is not detected on the main page of Halton Arp. 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: