1.7 sec in total
222 ms
1 sec
459 ms
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Visit lejos.orgWe analyzed Lejos.org page load time and found that the first response time was 222 ms and then it took 1.5 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 30% of websites can load faster.
lejos.org performance score
name
value
score
weighting
Value3.8 s
27/100
10%
Value4.1 s
47/100
25%
Value4.8 s
67/100
10%
Value440 ms
63/100
30%
Value0.01
100/100
15%
Value7.0 s
53/100
10%
222 ms
223 ms
78 ms
20 ms
87 ms
Our browser made a total of 27 requests to load all elements on the main page. We found that 63% of them (17 requests) were addressed to the original Lejos.org, 11% (3 requests) were made to S.ytimg.com and 7% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (223 ms) belongs to the original domain Lejos.org.
Page size can be reduced by 402.9 kB (62%)
647.1 kB
244.2 kB
In fact, the total size of Lejos.org main page is 647.1 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. 35% of websites need less resources to load. CSS take 246.4 kB which makes up the majority of the site volume.
Potential reduce by 22.8 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 22.8 kB or 74% of the original size.
Potential reduce by 38.6 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. Obviously, Lejos needs image optimization as it can save up to 38.6 kB or 25% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 136.7 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 136.7 kB or 64% of the original size.
Potential reduce by 204.9 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. Lejos.org needs all CSS files to be minified and compressed as it can save up to 204.9 kB or 83% of the original size.
Number of requests can be reduced by 4 (17%)
23
19
The browser has sent 23 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Lejos. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for JavaScripts and as a result speed up the page load time.
lejos.org
222 ms
www.lejos.org
223 ms
lejos.css
78 ms
urchin.js
20 ms
lejosLogo.jpg
87 ms
legoMindstorms.jpg
72 ms
sourceforgeButton.jpg
88 ms
java.netButton.jpg
85 ms
ev3Button.jpg
86 ms
nxtButton.jpg
135 ms
rcxButton.jpg
111 ms
lejosNews.jpg
98 ms
nxj.jpg
127 ms
max_nxt_3_thumb.jpg
149 ms
intelligence_unleashed_thumb.jpg
148 ms
maximum_nxt_thumb.jpg
127 ms
rcxjava.jpg
139 ms
nxt_robot.jpg
155 ms
6dqgHE8g4is
128 ms
__utm.gif
10 ms
www-embed-player-vflQrT_sR.css
65 ms
www-embed-player.js
115 ms
base.js
189 ms
6BOEML_YqI6cKINK5dmh8ZufcXg7sBa4jeB-I9gQ0xI.js
45 ms
ad_status.js
41 ms
zN7GBFwfMP4uA6AR0HCoLQ.ttf
102 ms
RxZJdnzeo3R5zSexge8UUaCWcynf_cDxXwCLxiixG1c.ttf
110 ms
lejos.org accessibility score
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
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
Links do not have a discernible name
lejos.org best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Displays images with incorrect aspect ratio
General
Impact
Issue
Detected JavaScript libraries
Browser errors were logged to the console
Page has valid source maps
lejos.org SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
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
Document uses legible font sizes
EN
EN
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Lejos.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 Lejos.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.
lejos.org
Open Graph description is not detected on the main page of Lejos. 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: