2.6 sec in total
111 ms
630 ms
1.9 sec
Click here to check amazing S4A content for Greece. Otherwise, check out these important facts you probably never knew about s4a.cat
S4A - Scratch for Arduino is a Scratch modification that brings the easiness of programming with Scratch to the Arduino prototyping board
Visit s4a.catWe analyzed S4a.cat page load time and found that the first response time was 111 ms and then it took 2.5 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.
s4a.cat performance score
name
value
score
weighting
Value2.4 s
70/100
10%
Value11.6 s
0/100
25%
Value5.9 s
48/100
10%
Value1,200 ms
21/100
30%
Value0.038
100/100
15%
Value11.9 s
16/100
10%
111 ms
6 ms
8 ms
10 ms
40 ms
Our browser made a total of 33 requests to load all elements on the main page. We found that 79% of them (26 requests) were addressed to the original S4a.cat, 6% (2 requests) were made to Google-analytics.com and 6% (2 requests) were made to Youtube.com. The less responsive or slowest element that took the longest time to load (142 ms) relates to the external source Youtube.com.
Page size can be reduced by 439.1 kB (49%)
897.1 kB
457.9 kB
In fact, the total size of S4a.cat main page is 897.1 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. 45% of websites need less resources to load. Images take 391.7 kB which makes up the majority of the site volume.
Potential reduce by 32.4 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. This page needs HTML code to be minified as it can gain 10.6 kB, which is 24% 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 32.4 kB or 75% of the original size.
Potential reduce by 71.1 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, S4A needs image optimization as it can save up to 71.1 kB or 18% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 126.1 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 126.1 kB or 60% of the original size.
Potential reduce by 209.6 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. S4a.cat needs all CSS files to be minified and compressed as it can save up to 209.6 kB or 83% of the original size.
Number of requests can be reduced by 5 (16%)
32
27
The browser has sent 32 CSS, Javascripts, AJAX and image requests in order to completely render the main page of S4A. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 6 to 1 for JavaScripts and as a result speed up the page load time.
s4a.cat
111 ms
normalize.min.css
6 ms
main.css
8 ms
modernizr-2.6.2-respond-1.1.0.min.js
10 ms
jquery-1.10.1.min.js
40 ms
main.js
6 ms
portamento.js
38 ms
pixel.gif
102 ms
ga.js
86 ms
logo.png
22 ms
citilab.png
79 ms
shot01.png
28 ms
blocks.png
26 ms
donate-en.png
78 ms
button_led.png
78 ms
rgb_led.png
21 ms
switch_led.png
23 ms
photoresistor_led.png
81 ms
hi-s4a-qr.png
81 ms
shot02.jpg
80 ms
3steps.png
87 ms
marina.png
78 ms
victor.png
77 ms
joan.png
87 ms
jose.png
82 ms
bernat.png
87 ms
jordi.png
81 ms
balloon.png
84 ms
__utm.gif
27 ms
IzGGv9xkkRs
91 ms
RJAgSUIf12U
142 ms
www-embed-player-vflQrT_sR.css
64 ms
www-embed-player.js
95 ms
s4a.cat 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
<frame> or <iframe> elements do not have a title
Image elements do not have [alt] attributes
Links do not have a discernible name
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
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
<html> element does not have a [lang] attribute
Tables and lists
These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.
Impact
Issue
Lists do not contain only <li> elements and script supporting elements (<script> and <template>).
s4a.cat best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Serves images with low resolution
General
Impact
Issue
Detected JavaScript libraries
s4a.cat 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
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
Tap targets are not sized appropriately
EN
N/A
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise S4a.cat 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 S4a.cat 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.
s4a.cat
Open Graph description is not detected on the main page of S4A. 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: