6.5 sec in total
1.8 sec
4.5 sec
228 ms
Click here to check amazing ROS content for China. Otherwise, check out these important facts you probably never knew about ros.org
Visit ros.orgWe analyzed Ros.org page load time and found that the first response time was 1.8 sec and then it took 4.7 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.
ros.org performance score
name
value
score
weighting
Value4.6 s
14/100
10%
Value4.9 s
28/100
25%
Value21.8 s
0/100
10%
Value68,170 ms
0/100
30%
Value0.036
100/100
15%
Value84.6 s
0/100
10%
1784 ms
1509 ms
226 ms
755 ms
26 ms
Our browser made a total of 39 requests to load all elements on the main page. We found that 85% of them (33 requests) were addressed to the original Ros.org, 10% (4 requests) were made to Google-analytics.com and 3% (1 request) were made to Fonts.googleapis.com. The less responsive or slowest element that took the longest time to load (1.8 sec) belongs to the original domain Ros.org.
Page size can be reduced by 531.4 kB (37%)
1.5 MB
919.3 kB
In fact, the total size of Ros.org main page is 1.5 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. 35% of websites need less resources to load. Images take 902.3 kB which makes up the majority of the site volume.
Potential reduce by 28.4 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 28.4 kB or 78% of the original size.
Potential reduce by 125.3 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. Obviously, ROS needs image optimization as it can save up to 125.3 kB or 14% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 160.0 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 160.0 kB or 63% of the original size.
Potential reduce by 217.7 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. Ros.org needs all CSS files to be minified and compressed as it can save up to 217.7 kB or 84% of the original size.
Number of requests can be reduced by 17 (47%)
36
19
The browser has sent 36 CSS, Javascripts, AJAX and image requests in order to completely render the main page of ROS. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 15 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.
ros.org
1784 ms
www.ros.org
1509 ms
otw_sbm.css
226 ms
compiled-css-1436445281.css
755 ms
css
26 ms
style.css
313 ms
jquery.js
627 ms
jquery-migrate.js
473 ms
external-tracking.js
275 ms
script.bootstrap.min.js
195 ms
script.resize.js
169 ms
script.viewport.js
202 ms
script.waypoints.js
249 ms
script.easing.js
278 ms
script.fitvids.js
284 ms
parallax.js
330 ms
pl.common.js
360 ms
jquery.flexslider-min.js
362 ms
navbar.js
365 ms
analytics.js
66 ms
99oTyT5.png
179 ms
ROS%208%20Years-thumb-640x358-1326.png
112 ms
rosorg-logo1.png
112 ms
hero_intro.jpg
412 ms
hero_research.jpg
167 ms
hero_product.jpg
250 ms
hero_education.jpg
171 ms
hero_fun.jpg
251 ms
wiki.png
166 ms
answers.png
248 ms
blog.png
249 ms
google-plus-3-l.png
251 ms
ros-patternB.png
319 ms
ga.js
32 ms
roboto-regular-webfont.woff
267 ms
collect
35 ms
ROS%208%20Years-thumb-640x358-1326.png
387 ms
__utm.gif
11 ms
bg_direction_nav.png
84 ms
ros.org accessibility score
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
Buttons do not have an accessible name
<frame> or <iframe> elements do not have a title
Image elements do not have [alt] attributes
Links do not have a discernible name
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
Heading elements are not in a sequentially-descending order
ros.org best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Serves images with low resolution
General
Impact
Issue
Detected JavaScript libraries
ros.org SEO score
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
Links do not have descriptive text
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
Document uses legible font sizes
Tap targets are not sized appropriately
EN
EN
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Ros.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 Ros.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.
ros.org
Open Graph description is not detected on the main page of ROS. 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: