Access gym-karvina.cz. Úvodní stránka | Gymnázium Karviná, příspěvková organizace

name

value

score

weighting

FCP (First Contentful Paint)

Value3.1 s

46/100

10%

LCP (Largest Contentful Paint)

Value6.6 s

8/100

25%

SI (Speed Index)

Value4.7 s

69/100

10%

TBT (Total Blocking Time)

Value40 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.043

99/100

15%

TTI (Time to Interactive)

Value5.3 s

73/100

10%

gym-karvina.cz

917 ms

gk_2014.css

289 ms

js-image-slider.css

420 ms

js-image-slider.js

561 ms

jquery-1.7.2.min.js

737 ms

Our browser made a total of 76 requests to load all elements on the main page. We found that all of those requests were addressed to Gym-karvina.cz and no external sources were called. The less responsive or slowest element that took the longest time to load (1.5 sec) belongs to the original domain Gym-karvina.cz.

Content Size

1.5 MB

After Optimization

1.3 MB

In fact, the total size of Gym-karvina.cz 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. 45% of websites need less resources to load. Images take 1.3 MB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 82.2 kB

Original 98.9 kB
After minification 97.7 kB
After compression 16.7 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 82.2 kB or 83% of the original size.

Image Optimization

-7%

Potential reduce by 92.3 kB

Original 1.3 MB
After minification 1.2 MB

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. Gym Karvina images are well optimized though.

JavaScript Optimization

-65%

Potential reduce by 79.7 kB

Original 122.6 kB
After minification 119.1 kB
After compression 43.0 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 79.7 kB or 65% of the original size.

CSS Optimization

-82%

Potential reduce by 16.2 kB

Original 19.8 kB
After minification 12.4 kB
After compression 3.5 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. Gym-karvina.cz needs all CSS files to be minified and compressed as it can save up to 16.2 kB or 82% of the original size.

Requests Now

After Optimization

The browser has sent 75 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Gym Karvina. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests and as a result speed up the page load time.

Accessibility Issues

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.

High

Buttons do not have an accessible name

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

These are opportunities to improve keyboard navigation in your application.

High

Heading elements are not in a sequentially-descending order

These are opportunities to improve the interpretation of your content by users in different locales.

High

<html> element does not have a [lang] attribute

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

High

Serves images with low resolution

Low

Detected JavaScript libraries

Search Engine Optimization Advices

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

High

Links are not crawlable

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

High

Image elements do not have [alt] attributes

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/).

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

Language Detected

CS
Language Claimed

N/A
Encoding

UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Gym-karvina.cz can be misinterpreted by Google and other search engines. Our service has detected that Czech 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 Gym-karvina.cz 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

gym-karvina.cz

Open Graph description is not detected on the main page of Gym Karvina. 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:

Report Summary

Performance

Accessibility

Best Practices

SEO

Úvodní stránka | Gymnázium Karviná, příspěvková organizace

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

gym-karvina.cz

gk_2014.css

js-image-slider.css

js-image-slider.js

jquery-1.7.2.min.js

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

gym-karvina.cz

gk_2014.css

js-image-slider.css

js-image-slider.js

jquery-1.7.2.min.js

lightbox.js

lightbox.css

GK_zima_2016_700x250.jpg

vv_vernisaz.jpg

vv_vernisaz2.jpg

bicykl.png

rohace_mini.jpg

france.png

germany.png

mo.png

futsalisti.jpg

lyzak_1a_2016_all_mini.jpg

russian.png

policie_znak.png

globe_videokonference_mini.jpg

vykricnik_full.png

img_9552.jpg

hokej_2016_mini.jpg

wolker_1_mini.jpg

spain.jpg

england.jpg

mapytrezor.png

hokej_trailer.png

dance.png

wolker.png

vv_2015.jpg

vzp_badmint_all_mini.jpg

vzp_futsal_all_mini.jpg

vzp_plavani_mini.jpg

plavci_kluci_mini.jpg

plavci_divky_mini.jpg

mikulas_1_mini.jpg

viden_2015_(1).jpg

michalicka_foto.jpg

superpc_ov_mini.jpg

naboj_logo_60.png

nova_telocvicna.jpg

den_ot_dv_mini.jpg