Tools & Wizards About Us
astronomicaltelescopes.spiedigitallibrary.org screenshot

Report Summary

  • 10

    Performance

    Renders faster than
    23% of other websites

  • 88

    Accessibility

    Visual factors better than
    that of 68% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 85

    SEO

    Google-friendlier than
    55% of websites

astronomicaltelescopes.spiedigitallibrary.org

Journal of Astronomical Telescopes, Instruments, and Systems

Page Load Speed

2.6 sec in total

First Response

196 ms

Resources Loaded

2.1 sec

Page Rendered

328 ms

astronomicaltelescopes.spiedigitallibrary.org screenshot

About Website

Welcome to astronomicaltelescopes.spiedigitallibrary.org homepage info - get ready to check Astronomical Telescopes Spiedigitallibrary best content for China right away, or after learning these important things about astronomicaltelescopes.spiedigitallibrary.org

The Journal of Astronomical Telescopes, Instruments, and Systems covers ground- and space-based astronomy from development to acting systems.

Visit astronomicaltelescopes.spiedigitallibrary.org

Key Findings

We analyzed Astronomicaltelescopes.spiedigitallibrary.org page load time and found that the first response time was 196 ms and then it took 2.4 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 45% of websites can load faster.

Performance Metrics

astronomicaltelescopes.spiedigitallibrary.org performance score

10

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value8.3 s

0/100

10%

LCP (Largest Contentful Paint)

Value11.2 s

0/100

25%

SI (Speed Index)

Value10.3 s

8/100

10%

TBT (Total Blocking Time)

Value2,070 ms

7/100

30%

CLS (Cumulative Layout Shift)

Value0.265

46/100

15%

TTI (Time to Interactive)

Value18.7 s

3/100

10%

Network Requests Diagram

journal-of-astronomical-telescopes-instruments-and-systems

196 ms

MathJax.js

23 ms

gpt.js

65 ms

casa.js

51 ms

dlcss

197 ms

Our browser made a total of 65 requests to load all elements on the main page. We found that 0% of them (0 request) were addressed to the original Astronomicaltelescopes.spiedigitallibrary.org, 18% (12 requests) were made to and 6% (4 requests) were made to Securepubads.g.doubleclick.net. The less responsive or slowest element that took the longest time to load (651 ms) relates to the external source Spiedigitallibrary.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 119.3 kB (13%)

Content Size

934.0 kB

After Optimization

814.8 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Astronomicaltelescopes.spiedigitallibrary.org main page is 934.0 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. 65% of websites need less resources to load. Images take 422.7 kB which makes up the majority of the site volume.

HTML Optimization

-82%

Potential reduce by 76.0 kB

  • Original 93.1 kB
  • After minification 78.4 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. This page needs HTML code to be minified as it can gain 14.7 kB, which is 16% 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 76.0 kB or 82% of the original size.

Image Optimization

-5%

Potential reduce by 22.4 kB

  • Original 422.7 kB
  • After minification 400.3 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. Astronomical Telescopes Spiedigitallibrary images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 421 B

  • Original 304.0 kB
  • After minification 304.0 kB
  • After compression 303.6 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

-18%

Potential reduce by 20.5 kB

  • Original 114.2 kB
  • After minification 114.2 kB
  • After compression 93.7 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. Astronomicaltelescopes.spiedigitallibrary.org needs all CSS files to be minified and compressed as it can save up to 20.5 kB or 18% of the original size.

Requests Breakdown

Number of requests can be reduced by 27 (54%)

Requests Now

50

After Optimization

23

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 50 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Astronomical Telescopes Spiedigitallibrary. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 17 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

journal-of-astronomical-telescopes-instruments-and-systems

journal-of-astronomical-telescopes-instruments-and-systems

196 ms

MathJax.js

MathJax.js

23 ms

gpt.js

gpt.js

65 ms

casa.js

casa.js

51 ms

dlcss

dlcss

197 ms

fonts.css

fonts.css

107 ms

jquery

jquery

222 ms

bootstrap

bootstrap

195 ms

js

js

196 ms

iMAWebCookie.js

iMAWebCookie.js

193 ms

cookieconsent.min.css

cookieconsent.min.css

58 ms

cookieconsent.min.js

cookieconsent.min.js

104 ms

passwordVisibility.js

passwordVisibility.js

219 ms

_Incapsula_Resource

_Incapsula_Resource

37 ms

MML_CHTML.js

MML_CHTML.js

195 ms

pubads_impl.js

pubads_impl.js

17 ms

ppub_config

ppub_config

155 ms

9A5EDA3022A57D98B.css

9A5EDA3022A57D98B.css

651 ms

gtm.js

gtm.js

173 ms

SPIE_Logo_Header.svg

SPIE_Logo_Header.svg

91 ms

SPIE_DL_Logo_Header.svg

SPIE_DL_Logo_Header.svg

206 ms

CC_logo_header.svg

CC_logo_header.svg

10 ms

o-o_top_logo.svg

o-o_top_logo.svg

281 ms

SPIE_DL_Logo_Nav.svg

SPIE_DL_Logo_Nav.svg

283 ms

jatis-10-2-270.jpg

jatis-10-2-270.jpg

351 ms

JATIS%20High%20Speed%20Atomic%20Oxygen.png

JATIS%20High%20Speed%20Atomic%20Oxygen.png

286 ms

JATIS%20Lessons%20Learned.png

JATIS%20Lessons%20Learned.png

348 ms

JATIS%20Laser%20frequency%20comb.png

JATIS%20Laser%20frequency%20comb.png

286 ms

CircleAnchor.svg

CircleAnchor.svg

498 ms

OpenAccessIcon.svg

OpenAccessIcon.svg

510 ms

Alerts_Mark.svg

Alerts_Mark.svg

367 ms

Review_Icon.svg

Review_Icon.svg

499 ms

Access_Icon.svg

Access_Icon.svg

472 ms

Submit_Icon.svg

Submit_Icon.svg

574 ms

BackToTop.svg

BackToTop.svg

473 ms

Facebook_Footer.svg

Facebook_Footer.svg

475 ms

Twitter_Footer_X.svg

Twitter_Footer_X.svg

515 ms

LinkedIn_Footer.svg

LinkedIn_Footer.svg

482 ms

SPIE_Logo_Footer.svg

SPIE_Logo_Footer.svg

568 ms

Float_Nav_SPIE_Logo.svg

Float_Nav_SPIE_Logo.svg

503 ms

cross.png

cross.png

583 ms

Rail_Carrot.svg

Rail_Carrot.svg

580 ms

ads

ads

217 ms

container.html

container.html

95 ms

Search_HP_Icon.svg

Search_HP_Icon.svg

506 ms

qrWMTH5+9OlvLdZ7X3wBgchag

qrWMTH5+9OlvLdZ7X3wBgchag

5 ms

qrWMTH5+9OlvLdZ7X3wBgchag

qrWMTH5+9OlvLdZ7X3wBgchag

4 ms

uBXbKumYWkoiof6q1jEx+fvTpby3We198AYHIWoA==

uBXbKumYWkoiof6q1jEx+fvTpby3We198AYHIWoA==

4 ms

qrWMTH5+9OlvLdZ7X3wBgchag

qrWMTH5+9OlvLdZ7X3wBgchag

4 ms

j00NWhWp4Hef0dsZUUBw==

j00NWhWp4Hef0dsZUUBw==

31 ms

qd+TGu6XJzLwK3qzzXKYeqc+L442CIxHdRkZdbYGaLU7ja73I7tkXbsoSEVVPlx0npf49NDVoVqeB3n9HbGVFAc=

qd+TGu6XJzLwK3qzzXKYeqc+L442CIxHdRkZdbYGaLU7ja73I7tkXbsoSEVVPlx0npf49NDVoVqeB3n9HbGVFAc=

31 ms

R2xlRQH

R2xlRQH

31 ms

qd+TGu6XJzLwK3qzzXKYeqc+L442CIxHdRkZdbYGaLU7ja73I7tkXbsoSEVVPlx0npf49NDVoVqeB3n9HbGVFAc=

qd+TGu6XJzLwK3qzzXKYeqc+L442CIxHdRkZdbYGaLU7ja73I7tkXbsoSEVVPlx0npf49NDVoVqeB3n9HbGVFAc=

30 ms

R2xlRQH

R2xlRQH

30 ms

R2xlRQH

R2xlRQH

30 ms

j00NWhWp4Hef0dsZUUBw==

j00NWhWp4Hef0dsZUUBw==

30 ms

j00NWhWp4Hef0dsZUUBw==

j00NWhWp4Hef0dsZUUBw==

30 ms

insight.min.js

insight.min.js

109 ms

scholar_casa

scholar_casa

248 ms

6337062616480098768

6337062616480098768

198 ms

abg_lite.js

abg_lite.js

200 ms

window_focus.js

window_focus.js

204 ms

ufs_web_display.js

ufs_web_display.js

98 ms

_Incapsula_Resource

_Incapsula_Resource

222 ms

insight_tag_errors.gif

insight_tag_errors.gif

125 ms

Accessibility Review

astronomicaltelescopes.spiedigitallibrary.org accessibility score

88

Accessibility Issues

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best Practices

astronomicaltelescopes.spiedigitallibrary.org best practices score

75

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

High

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

astronomicaltelescopes.spiedigitallibrary.org SEO score

85

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

Content Best Practices

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

Impact

Issue

High

Image elements do not have [alt] attributes

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

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Astronomicaltelescopes.spiedigitallibrary.org 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 Astronomicaltelescopes.spiedigitallibrary.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

astronomicaltelescopes.spiedigitallibrary.org

Open Graph description is not detected on the main page of Astronomical Telescopes Spiedigitallibrary. 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: