Tools & Wizards About Us
www-ssrl.slac.stanford.edu screenshot

Report Summary

  • 30

    Performance

    Renders faster than
    50% of other websites

  • 57

    Accessibility

    Visual factors better than
    that of 24% of websites

  • 50

    Best Practices

    More advanced features
    available than in
    18% of websites

  • 54

    SEO

    Google-friendlier than
    19% of websites

www-ssrl.slac.stanford.edu

Welcome to Stanford Synchrotron Radiation Lightsource | Stanford Synchrotron Radiation Lightsource

Page Load Speed

3 sec in total

First Response

606 ms

Resources Loaded

2.3 sec

Page Rendered

130 ms

www-ssrl.slac.stanford.edu screenshot

About Website

Click here to check amazing Www Ssrl Slac Stanford content for United States. Otherwise, check out these important facts you probably never knew about www-ssrl.slac.stanford.edu

The Stanford Synchrotron Radiation Lightsource (SSRL) provides synchrotron radiation, a name given to X-rays or light produced by electrons circulating in a storage ring at nearly the speed of light. ...

Visit www-ssrl.slac.stanford.edu

Key Findings

We analyzed Www-ssrl.slac.stanford.edu page load time and found that the first response time was 606 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

www-ssrl.slac.stanford.edu performance score

30

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.0 s

22/100

10%

LCP (Largest Contentful Paint)

Value7.1 s

5/100

25%

SI (Speed Index)

Value5.6 s

53/100

10%

TBT (Total Blocking Time)

Value2,480 ms

4/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value7.3 s

50/100

10%

Network Requests Diagram

www-ssrl.slac.stanford.edu

606 ms

css_gKtUjzaD_2X5-fYNa7Cj895jyQcYjZKGhH80K02Wg44.css

152 ms

css_vZ_wrMQ9Og-YPPxa1q4us3N7DsZMJa-14jShHgRoRNo.css

150 ms

css_Iqnkc2FWFEJPTs9aFEOC4B38X2m9oHq1_XmIVC_K6Wc.css

217 ms

css_6zgMjxEczcsHJKzggfhohaA4Yq-zovvxljNqNCmHaPw.css

145 ms

Our browser made a total of 42 requests to load all elements on the main page. We found that 90% of them (38 requests) were addressed to the original Www-ssrl.slac.stanford.edu, 5% (2 requests) were made to Google-analytics.com and 2% (1 request) were made to Portal.slac.stanford.edu. The less responsive or slowest element that took the longest time to load (1 sec) relates to the external source Portal.slac.stanford.edu.

Page Optimization Overview & Recommendations

Page size can be reduced by 341.9 kB (46%)

Content Size

735.9 kB

After Optimization

394.0 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Www-ssrl.slac.stanford.edu main page is 735.9 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. 20% of websites need less resources to load. Images take 313.5 kB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 45.1 kB

  • Original 56.8 kB
  • After minification 52.5 kB
  • After compression 11.8 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 45.1 kB or 79% of the original size.

Image Optimization

-7%

Potential reduce by 21.7 kB

  • Original 313.5 kB
  • After minification 291.9 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. Www Ssrl Slac Stanford images are well optimized though.

JavaScript Optimization

-75%

Potential reduce by 226.7 kB

  • Original 303.1 kB
  • After minification 238.3 kB
  • After compression 76.4 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 226.7 kB or 75% of the original size.

CSS Optimization

-78%

Potential reduce by 48.5 kB

  • Original 62.4 kB
  • After minification 61.1 kB
  • After compression 13.9 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. Www-ssrl.slac.stanford.edu needs all CSS files to be minified and compressed as it can save up to 48.5 kB or 78% of the original size.

Requests Breakdown

Number of requests can be reduced by 18 (44%)

Requests Now

41

After Optimization

23

  • Images
  • JavaScript
  • CSS

The browser has sent 41 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Www Ssrl Slac Stanford. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 8 to 1 for JavaScripts and from 6 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

www-ssrl.slac.stanford.edu

www-ssrl.slac.stanford.edu

606 ms

css_gKtUjzaD_2X5-fYNa7Cj895jyQcYjZKGhH80K02Wg44.css

css_gKtUjzaD_2X5-fYNa7Cj895jyQcYjZKGhH80K02Wg44.css

152 ms

css_vZ_wrMQ9Og-YPPxa1q4us3N7DsZMJa-14jShHgRoRNo.css

css_vZ_wrMQ9Og-YPPxa1q4us3N7DsZMJa-14jShHgRoRNo.css

150 ms

css_Iqnkc2FWFEJPTs9aFEOC4B38X2m9oHq1_XmIVC_K6Wc.css

css_Iqnkc2FWFEJPTs9aFEOC4B38X2m9oHq1_XmIVC_K6Wc.css

217 ms

css_6zgMjxEczcsHJKzggfhohaA4Yq-zovvxljNqNCmHaPw.css

css_6zgMjxEczcsHJKzggfhohaA4Yq-zovvxljNqNCmHaPw.css

145 ms

css_X4XnnH2nLEjsULZ-Lr2ibqkDW8CZz0ReeqrQHOIXJn4.css

css_X4XnnH2nLEjsULZ-Lr2ibqkDW8CZz0ReeqrQHOIXJn4.css

223 ms

js_MG2mAeTPw6UhklY_SgV9St7ugWHPu3aFJezoNDTlCOA.js

js_MG2mAeTPw6UhklY_SgV9St7ugWHPu3aFJezoNDTlCOA.js

558 ms

js_obFUyTbqtcoGQtszVI46l1_oD927PzlDtlr_ilpYBqE.js

js_obFUyTbqtcoGQtszVI46l1_oD927PzlDtlr_ilpYBqE.js

226 ms

js_NpX2cwCeepkWZZ194B6-ViyVBHleaYLOx5R9EWBOMRU.js

js_NpX2cwCeepkWZZ194B6-ViyVBHleaYLOx5R9EWBOMRU.js

227 ms

js_AFTqqs8Aq8Sx6TW_eTnU8wFN9l7S1e4jllqcQF0BUME.js

js_AFTqqs8Aq8Sx6TW_eTnU8wFN9l7S1e4jllqcQF0BUME.js

483 ms

js_D3gaWDovdngGvy7Ar8cOr5P3FJZDJ4dJMGHTZV2zNIY.js

js_D3gaWDovdngGvy7Ar8cOr5P3FJZDJ4dJMGHTZV2zNIY.js

289 ms

js_NM8iRGSMhg2csy5yUyqj20K-TFC9ObhoIVMl6b0hn1c.js

js_NM8iRGSMhg2csy5yUyqj20K-TFC9ObhoIVMl6b0hn1c.js

298 ms

analytics.js

analytics.js

54 ms

AlertSignRedSq200.jpg

AlertSignRedSq200.jpg

1023 ms

logo.png

logo.png

145 ms

blueBarGradient.png

blueBarGradient.png

80 ms

main-menu-borders.png

main-menu-borders.png

81 ms

DOE.png

DOE.png

82 ms

story-oxygen-vacancy-photovoltaic_20160229.jpg

story-oxygen-vacancy-photovoltaic_20160229.jpg

989 ms

story-raf-inhibitors_20160229.jpg

story-raf-inhibitors_20160229.jpg

600 ms

story-geochemical-aquifers-arsenic-mobilization_20160229.jpg

story-geochemical-aquifers-arsenic-mobilization_20160229.jpg

733 ms

story-lithium-ion-battery_20160131.jpg

story-lithium-ion-battery_20160131.jpg

608 ms

blueGradient.png

blueGradient.png

156 ms

front-user-support.jpg

front-user-support.jpg

218 ms

spear_dcctplot.php

spear_dcctplot.php

247 ms

front-science.jpg

front-science.jpg

355 ms

newsletter.png

newsletter.png

319 ms

bullet2.png

bullet2.png

391 ms

bullet.png

bullet.png

428 ms

SLAC.png

SLAC.png

469 ms

flickr.png

flickr.png

500 ms

youtube.png

youtube.png

542 ms

twitter.png

twitter.png

578 ms

cbe9c860-d1ec-45be-abd4-3e391f54378b.js

cbe9c860-d1ec-45be-abd4-3e391f54378b.js

32 ms

extlink_s.png

extlink_s.png

571 ms

arrows-ffffff.png

arrows-ffffff.png

609 ms

shadow.png

shadow.png

693 ms

collect

collect

26 ms

css_O6GTL_JLuNAiU0XnvLknyzTyB6QAlZqcNjw9HupIff4.css

css_O6GTL_JLuNAiU0XnvLknyzTyB6QAlZqcNjw9HupIff4.css

75 ms

overlay.png

overlay.png

76 ms

loading.gif

loading.gif

78 ms

close.gif

close.gif

75 ms

Accessibility Review

www-ssrl.slac.stanford.edu accessibility score

57

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best Practices

www-ssrl.slac.stanford.edu best practices score

50

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

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

www-ssrl.slac.stanford.edu SEO score

54

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

High

Image elements do not have [alt] attributes

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

robots.txt is not valid

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 Www-ssrl.slac.stanford.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 Www-ssrl.slac.stanford.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

www-ssrl.slac.stanford.edu

Open Graph data is detected on the main page of Www Ssrl Slac Stanford. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: