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black-holes.org screenshot

Report Summary

  • 31

    Performance

    Renders faster than
    51% of other websites

  • 92

    Accessibility

    Visual factors better than
    that of 78% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 85

    SEO

    Google-friendlier than
    55% of websites

black-holes.org

Home - SXS - Simulating eXtreme Spacetimes

Page Load Speed

3.4 sec in total

First Response

198 ms

Resources Loaded

2.8 sec

Page Rendered

418 ms

black-holes.org screenshot

About Website

Welcome to black-holes.org homepage info - get ready to check Black Holes best content for United States right away, or after learning these important things about black-holes.org

The SXS project is a collaborative research effort involving multiple institutions. Our goal is the simulation of black holes and other extreme spacetimes to gain a better understanding of Relativity,...

Visit black-holes.org

Key Findings

We analyzed Black-holes.org page load time and found that the first response time was 198 ms and then it took 3.2 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.

Performance Metrics

black-holes.org performance score

31

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.8 s

4/100

10%

LCP (Largest Contentful Paint)

Value9.0 s

1/100

25%

SI (Speed Index)

Value7.1 s

31/100

10%

TBT (Total Blocking Time)

Value650 ms

46/100

30%

CLS (Cumulative Layout Shift)

Value0.157

74/100

15%

TTI (Time to Interactive)

Value10.0 s

26/100

10%

Network Requests Diagram

black-holes.org

198 ms

black-holes.org

305 ms

www.black-holes.org

900 ms

jquery-ui-1.10.2.custom.css

72 ms

jquery-ui-1.9.2.custom.css

145 ms

Our browser made a total of 90 requests to load all elements on the main page. We found that 82% of them (74 requests) were addressed to the original Black-holes.org, 9% (8 requests) were made to Fonts.gstatic.com and 3% (3 requests) were made to Fonts.googleapis.com. The less responsive or slowest element that took the longest time to load (900 ms) belongs to the original domain Black-holes.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 167.8 kB (15%)

Content Size

1.1 MB

After Optimization

920.2 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Black-holes.org main page is 1.1 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. 60% of websites need less resources to load. Images take 564.0 kB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 63.3 kB

  • Original 76.0 kB
  • After minification 55.7 kB
  • After compression 12.7 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 20.3 kB, which is 27% 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 63.3 kB or 83% of the original size.

Image Optimization

-10%

Potential reduce by 54.5 kB

  • Original 564.0 kB
  • After minification 509.5 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. Black Holes images are well optimized though.

JavaScript Optimization

-12%

Potential reduce by 44.4 kB

  • Original 380.7 kB
  • After minification 380.6 kB
  • After compression 336.3 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 44.4 kB or 12% of the original size.

CSS Optimization

-8%

Potential reduce by 5.5 kB

  • Original 67.2 kB
  • After minification 66.9 kB
  • After compression 61.7 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. Black-holes.org has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 36 (46%)

Requests Now

78

After Optimization

42

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 78 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Black Holes. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 24 to 1 for JavaScripts and from 14 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

black-holes.org

black-holes.org

198 ms

black-holes.org

black-holes.org

305 ms

www.black-holes.org

www.black-holes.org

900 ms

jquery-ui-1.10.2.custom.css

jquery-ui-1.10.2.custom.css

72 ms

jquery-ui-1.9.2.custom.css

jquery-ui-1.9.2.custom.css

145 ms

cdglossary.css

cdglossary.css

203 ms

widgetkit-2b909693.css

widgetkit-2b909693.css

208 ms

menu-d7fdcadf8f0c9f40ce6eff8799fb7bc9.css

menu-d7fdcadf8f0c9f40ce6eff8799fb7bc9.css

206 ms

grid-responsive.css

grid-responsive.css

211 ms

master-b303c1e5744d1b4f618d61af7361442b.css

master-b303c1e5744d1b4f618d61af7361442b.css

289 ms

mediaqueries.css

mediaqueries.css

213 ms

css

css

43 ms

gantry-custom.css

gantry-custom.css

270 ms

css

css

44 ms

settings.css

settings.css

274 ms

captions.css

captions.css

276 ms

php.default.namespaced.min.js

php.default.namespaced.min.js

353 ms

jquery-2.0.2.min.js

jquery-2.0.2.min.js

358 ms

jquery-migrate-1.2.1.js

jquery-migrate-1.2.1.js

338 ms

jquery-utils.js

jquery-utils.js

341 ms

jquery-ui-1.10.3.custom.min.js

jquery-ui-1.10.3.custom.min.js

470 ms

mootools-core.js

mootools-core.js

369 ms

core.js

core.js

405 ms

caption.js

caption.js

409 ms

cdglossary.js

cdglossary.js

423 ms

jquery.js

jquery.js

431 ms

widgetkit-e2e2f4e9.js

widgetkit-e2e2f4e9.js

434 ms

mootools-more.js

mootools-more.js

617 ms

gantry-totop.js

gantry-totop.js

517 ms

browser-engines.js

browser-engines.js

519 ms

rokmediaqueries.js

rokmediaqueries.js

520 ms

rokmediaqueries.js

rokmediaqueries.js

519 ms

responsive.js

responsive.js

535 ms

responsive-selectbox.js

responsive-selectbox.js

543 ms

jquery.themepunch.plugins.min.js

jquery.themepunch.plugins.min.js

560 ms

jquery.themepunch.revolution.min.js

jquery.themepunch.revolution.min.js

572 ms

MathJax.js

MathJax.js

34 ms

css

css

37 ms

lightbox.js

lightbox.js

72 ms

mediaelement-and-player.js

mediaelement-and-player.js

91 ms

spotlight.js

spotlight.js

97 ms

TeX-AMS-MML_HTMLorMML.js

TeX-AMS-MML_HTMLorMML.js

189 ms

analytics.js

analytics.js

218 ms

content_bg.png

content_bg.png

263 ms

header_bg.png

header_bg.png

263 ms

noise.png

noise.png

321 ms

sxs_logo4.png

sxs_logo4.png

307 ms

menu_bg.png

menu_bg.png

262 ms

spacegrid_bg.png

spacegrid_bg.png

261 ms

transparent.gif

transparent.gif

324 ms

planet.png

planet.png

392 ms

inspiral.png

inspiral.png

323 ms

blackholes.png

blackholes.png

320 ms

rocket.png

rocket.png

380 ms

arrows.png

arrows.png

389 ms

ticket.png

ticket.png

388 ms

videos.png

videos.png

407 ms

sounds.png

sounds.png

407 ms

glossary.png

glossary.png

443 ms

faq.png

faq.png

456 ms

downloads.png

downloads.png

457 ms

caltech_new_s.png

caltech_new_s.png

460 ms

csuf_s.png

csuf_s.png

462 ms

cita-icat_s_light.png

cita-icat_s_light.png

464 ms

cornell_new_s.png

cornell_new_s.png

510 ms

ae_engli_white_small.png

ae_engli_white_small.png

588 ms

oberlin_s.png

oberlin_s.png

524 ms

CrestUM_StackedBlue2767_TMR.png

CrestUM_StackedBlue2767_TMR.png

529 ms

utaustin_rgb_university_primary_stacked.png

utaustin_rgb_university_primary_stacked.png

531 ms

wsu_new_s_light.png

wsu_new_s_light.png

533 ms

concrete_bg.jpg

concrete_bg.jpg

413 ms

relativity2.jpg

relativity2.jpg

426 ms

gravitational_waves.png

gravitational_waves.png

433 ms

compact.png

compact.png

435 ms

numerical_relativity.png

numerical_relativity.png

437 ms

footer_bg.jpg

footer_bg.jpg

482 ms

ui-bg_glass_70_ede4d4_1x400.png

ui-bg_glass_70_ede4d4_1x400.png

490 ms

loader.gif

loader.gif

494 ms

timer.png

timer.png

502 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVc.ttf

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVc.ttf

46 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsg-1x4gaVc.ttf

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsg-1x4gaVc.ttf

82 ms

TK3_WkUHHAIjg75cFRf3bXL8LICs1_FvsUhiYA.ttf

TK3_WkUHHAIjg75cFRf3bXL8LICs1_FvsUhiYA.ttf

93 ms

TK3_WkUHHAIjg75cFRf3bXL8LICs169vsUhiYA.ttf

TK3_WkUHHAIjg75cFRf3bXL8LICs169vsUhiYA.ttf

114 ms

TK3_WkUHHAIjg75cFRf3bXL8LICs1xZosUhiYA.ttf

TK3_WkUHHAIjg75cFRf3bXL8LICs1xZosUhiYA.ttf

113 ms

memQYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWq8tWZ0Pw86hd0Rk8ZkWVAexQ.ttf

memQYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWq8tWZ0Pw86hd0Rk8ZkWVAexQ.ttf

113 ms

memQYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWq8tWZ0Pw86hd0RkyFjWVAexQ.ttf

memQYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWq8tWZ0Pw86hd0RkyFjWVAexQ.ttf

93 ms

4iCv6KVjbNBYlgoCjC3jsGyI.ttf

4iCv6KVjbNBYlgoCjC3jsGyI.ttf

93 ms

collect

collect

71 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

412 ms

js

js

68 ms

Accessibility Review

black-holes.org accessibility score

92

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

Best Practices

black-holes.org best practices score

83

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

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

black-holes.org SEO score

85

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

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 Black-holes.org 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 Black-holes.org 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

black-holes.org

Open Graph description is not detected on the main page of Black Holes. 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: