Quality and Performance report

Report generated on Aug 5, 2018 10:27:39 AM

Not so bad!
But still far from perfection






See your priorities


SIMULATED VISITOR: Chrome Paris 8.0/1.5Mbps (Latency: 50 ms) Edit





HTML CSS Scripts Images Others
Timeline / Waterfall

First Byte


Start Render


Fully loaded


Browser warnings 0OK
HTTP/2 Ready: 100%
Speed Index: 1063

Technologies :


Google AdSense

Google Analytics



Twitter Bootstrap


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Tips and best practices:

Things to improve



Consider using jQuery 1.12

You webpage uses jQuery 1.11.1. You should migrate to the latest version of the 1.x branch: jQuery 1.12, that contains several bug and security fixes.

Should I migrate to the last version of jQuery ?

Migrating from a 1. x version of jQuery to the latest version (3.x) can have many unintended impacts and means losing compatibility with older browsers. You should only consider abandoning jQuery 1.x as a part of a complete overhaul of your Front-End infrastructure. As you reflect on it, you will surely discover that you might not need jQuery.

Read more


The Content Security Policy is missing

Protect you website from cross-site scripting (XSS) attacks by setting up a restrictive Content-Security-Policy.

XSS attacks explained

XSS attacks are a type of attack in which malicious data is maliciously added to websites. The number of vulnerabilities allowing these attacks is quite large, which is why it is as useful to prevent them as to limit their harmful effects.

You can protect your pages against these attacks and their effects by restricting execution to code portions either legitimized by the domain to which they belong or by a unique integrity token. The code that does not corresponding to this security policy will not be executed and the user will be informed.

You can learn more about XSS attacks on the Open Web Application Security Project (OWASP) Website.

Configure a "Content-Security-Policy" (CSP) HTTP header

Set up a "Content-Security-Policy" (CSP) HTTP header to prevent or limit damage caused by an XSS attack. To specify a security policy configure your server so the response of the first resource contains the "Content-Security-Policy" HTTP header.

Here's an example:

Content-Security-Policy: script-src 'self' https://apis.google.com

In this case, only scripts coming from the current host or https://apis.google.com will be executed.

Read more about the CSP HTTP header. You can also look at the CSP directives specification.

Please, be careful, if the header is misconfigured, some of your content, scripts, or styles may be blocked. That could cause unwanted side effects. Moreover, the restrictions apply to all pages of the website. We recommend you test the different pages of your website before deploying this header in your production environment.

No Content Security Policy on this page: it is more easily exposed to XSS attacks.

Read more
Browser rendering 


Avoid CSS @import

Using CSS @import allows to add external stylesheet. In fact browsers cannot download them at the same time, this may add a delay to the rendering of the page. It is better to use the link tag. See more information.

The following external stylesheets were included in https://swiatliczb.pl/template/css/bootstrap.css using @import:

  • https://fonts.googleapis.com/css?family=Lato:400,700,400italic
  • //fonts.googleapis.com/css?family=Open+Sans:400italic,700italic,4...

The following external stylesheets were included in https://swiatliczb.pl/template/css/poprawki.css using @import:

  • //fonts.googleapis.com/css?family=Open+Sans:400italic,700italic,4...

Read more
Browser rendering 


Defer parsing of JavaScript

JavaScript can significantly slow down a page display, especially if it is necessary to download an external script.

Defer the use of JavaScript as much as possible to provide a faster start for the page display.

How can I fix this?

First of all, distinguish what portions of your JS is critical and must be loaded as soon as possible, and put them in a specific external file. Keep this file as streamlined as possible, and defer the parsing or execution of all other JS files (learn more).

Use one of the methods below to defer parsing for external JavaScript files:

  • use the async attribute;
  • use the defer attribute;
  • append the script to the DOM in JavaScript during the onload event;
  • make sure your scripts are placed at the bottom of the page (ideally at the end of the body).

36.3KiB of JavaScript is parsed during initial page load. Defer parsing JavaScript to reduce blocking of page rendering.

Read more


2 cookies are not secure

A cookie sent from the server to a web browser via the HTTPs protocol should only transit on a secure connection (except for some specific cases).

HTTP cookies

HTTP cookies are set by the server to the web browser via the Set-Cookie HTTP header. Then, the browser transmits the cookies to the server for the next requests by using the Cookie HTTP header. When the server uses a secure connection (HTTPs), the cookie probably contains some sensitive data: you have to guarantee that the cookie cannot be exploited on an insecure connection.

The Secure directive

By adding the Secure instruction in the Set-Cookie HTTP header, the server informs the browser that it is allowed to transmit the cookie over secure connection only. Read this blog post to learn more.

Caution: Ensure that the HTTP to HTTPS redirect is activated on your website. Otherwise, the Secure cookie may not be sent on HTTP request.

The following Cookies are not secure, you should add the Secure instruction in the Set-Cookie HTTP header:


  • set-cookie: PHPSESSID=d5f5c41bff8bacc2a7d63b6d2790e108; path=/


  • set-cookie: test_cookie=CheckForPermission; expires=Sun, 05-Aug-2018 10:42:42 GMT; path=/; domain=.doubleclick.net

Read more


This page is exposed to "clickjacking" type attacks

Keep malicious people from integrating your pages into their websites.

Clickjacking explained

This kind of attack happens when your page gets integrated with a malicious website via <frame> or <iframe> tags. By doing this, attackers can persuade users that they are on your own page when they are not. The unsuspecting user may enter personal information that is visible on and thus vulnerable to the malicious website.

To avoid this, always indicate which domains have permission to integrate your pages.

How to prevent clickjacking?

There are two main ways to prevent that behavior.

1/ Configure a "X-Frame-Options" HTTP header. Configure your server so the main resource response includes the "X-Frame-Options" HTTP header.

Three values may be defined:

  • DENY to prevent any frame or iframe from integrating the page;
  • SAMEORIGIN to authorize only frames from the same domain name;
  • ALLOW-FROM uri to indicate the domains allowed to integrate a page into frame (however is not compatible with some browsers)
  • 2/ Define an explicit frame-ancestors directive into a Content-Security-Policy HTTP Header. "frame-ancestors" directive is a newer, hence supported by fewer browsers, approach that will allow your website to authorize multiple domains instead of only the current origin. Setting this directive to 'none' is similar to X-Frame-Options: DENY.

    Which approach to choose? If you only have the current domain to allow, do set up the two security features, for better compatibility with older browsers. If you want to allow multiple domains, you should only implement the frame-ancestors security policy.

    Neither the "X-Frame-Options" HTTP header nor the "frame-ancestors" security police are configured on this page; you are more likely to be exposed to clickjacking.

    Read more


    4 empty elements can disturb screen readers

    <p>, <li>, <button>, <legend>, <caption>, <figcaption> and <quote> elements must not be empty because if they are, some screen readers will have difficulties interpreting their presence.

    Remove these empty elements from you code or decorate them with the aria-hidden attribute so that the screen readers ignore them.

    <p aria-hidden="true"></p>

    The following elements are empty:

    • <li class="divider">
    • <li class="divider">
    • <li class="divider">
    • <li class="divider">

    Read more
    Browser rendering 


    Avoid http-equiv <meta> tags

    HTTP headers are more efficient than the http-equiv meta tags.

    The <meta http-equiv=""/> tags

    The http-equiv meta tags allow to communicate to the web browser information equivalent to the ones of HTTP headers. For example, the meta <meta http-equiv="content-type"/> will have the same consequences than the HTTP Content-Type header.

    Two points don’t stimulate the use of http-equiv meta tags:

    • Going through the meta requires to interpret the beginning of the HTML page, which is slower than going through the HTTP headers in terms of performance
    • If the HTTP header is already present, the meta is ignored
    In which cases are the <meta http-equiv=""/> useful?

    Only one case can justify the presence of these meta tags: if you don’t have access to the configuration of your server, and that is to say to the HTTP headers.

    However, we advice you to use a configurable server so that you can establish the most efficient site possible.

    This page contains 1 http-equiv meta tag. If possible, you should replace it:

    • X-UA-Compatible

    Read more


    robots.txt file should be defined

    Indicate to web crawlers which URLs should be explored on your website.

    The robots.txt file

    Place your robots.txt file in the root of the website. It will be interpreted by the robots in charge of your SEO. It delivers instructions to specify the pages to explore by robots, like Google bot.

    Note that these directives are indicative only. A lambda robot will not be blocked by the restrictions specified by the file.

    We have not detected the robots.txt file on this website, you should define one:

    Read more


    Explain the purpose of each form field

    Clarify the purpose of each field will facilitate the user experience on your website.

    A form is composed of several fields that must be the most explicit possible for the user to quickly understand their function.

    Define a label

    You should prefer using the label tag:

    <label for="name">Fill your name:</label>
    <input id="name" type="text" name="name">

    Otherwise, you can use the aria-label or the title (not supported by all screen readers) attributes. Read more. Note that using the placeholder attribute is insufficient.

    This page contains 2 fields without any explanations:

    • <input name="liczba" type="text" class="form-control" placeholder="wpisz liczbę słownie i/lub cyframi">
    • <input name="liczba" type="text" class="form-control input-lg">

    Read more


    Specify a consistent label on your links

    A link is more attractive if the text describes what is behind it. You can also take the opportunity to use keywords in these texts, to improve your page's SEO.

    Describe the link in your <a> tag, rather than indicating the link itself. Example: <a href="http://mylink.com/">My description</a>

    The contents of the following links are not relevant:

    • <a href="627311561" title="Zapis liczbowy (cyfry)">627311561</a>
    • <a href="7,000029" title="Ułamek dziesiętny">7,000029</a>
    • <a href="110000" class="list-group-item h4">110000</a>
    • <a href="237064" class="list-group-item h6">237064</a>
    • <a href="120000" class="list-group-item h5">120000</a>
    • <a href="25323" class="list-group-item h3">25323</a>
    • and 21 other(s)

    Read more

    Did you know?


    SSL Certificate

    Your SSL certificate will expire on 01/31/2019. Update your certificate before that date.

    What happens if my certificate expires?

    Letting a certificate expire can have consequences for end users who will then see many error or alert messages while browsing the site, warning them of possible frauds, identity thefts or traffic interceptions. These alerts can have a very negative impact on the user's perception of the visited domain.

    Read more

    No HTML code is commented

    Comments allow you to detail a portion of code and help you navigate more efficiently in the DOM. However, make sure no sensitive information is exposed in your comments.

    Well done, none of your comments contains HTML code.

    Read more

    No <noscript> tag is detected

    When a web page uses scripts, it is advised to set at least one noscript tag. It is required to display a message when JavaScript is disabled by the user.

    <script  type="text/javascript">
    document.write('Hello World!')
    <noscript>Your browser does not support JavaScript!</noscript>

    Read more

    More informations about jQuery performance

    jQuery is the most used JavaScript library. Upgrade your website performance respecting the jQuery best practices. We recommend that you learn the basics of the jQuery performance, reading the following link: http://learn.jquery.com/performance/.

    Read more
    Data amount 

    This page does not load too much data (533kB)

    A too high page weight slows down the display, especially on low speed connections. This can lead to frustration for users paying for data (see whatdoesmysitecost.com).

    Evaluate the Weight of my Web Page

    In February 2016, the average weight of 100 most visited websites in the world was 1,38MB.

    How to reduce the weight of my page?

    You can report to our "Data amount" category to discover the possible optimizations in your case. Images are often involved.
    Moreover, make sure to build your web pages in order to load data that is essential to the user experience (rendering optimization of the critical path).
    For other contents (social networking plugins, advertising, content at the bottom of the page ...), it is better to delay the loading (asynchronous, lazy-loading ...), so they don't override priority contents.

    We strongly recommend that you define performance budgets before you carry out your web projects. These budgets can be settled through the Dareboost monitoring feature.

    We have established the weight distribution of the page by resource type:

    • JavaScript : 69,80% of total weight
    • Font : 16,83% of total weight
    • Texts : 7,84% of total weight
    • CSS : 4,39% of total weight
    • Images : 1,14% of total weight

    Here is the weight of the 10 heaviest resources over the network, and that are necessary to load the page:

    Read more

    This page contains 49 links

    Two kind of links exist:

    • Internal links that refer to pages with the same domain name;
    • External links that point to other websites (must be relevant and point towards quality content).

    If you reference many links, you can ask the SEO crawlers to consider only some of them, by adding the rel=nofollow attribute to the irrelevant ones (e.g., advertisements).

    Here is the distribution of 49 links present in the page:

    • 49 internal links (100,00%)
    • No "follow" external link (0,00%)
    • No "nofollow" external link (0,00%)

    Read more

    Well done, these best practices are respected



    Only one <base> element is defined

    Your page contains one <base> elements.

    The browser will only use the first values available for the href and the target attributes. Other values will be ignored. Please define only one <base> element with these values.

    Read more
    Browser rendering 


    Your HTML response is not too heavy

    Why reduce the code amount of a page?

    Before a web page can be displayed, the browser must, among other things, download it, parse it and model it into a document that can be understood by the rendering engine. If the amount of code contained in the page is too large, these steps are slowed down and the rendering is delayed.

    How to reduce the amount of code?

    Your HTML response should contain only the information that is immediately necessary to display the visible area of the page. Move inline information to external files (JS for scripts, CSS for styles, asynchronous queries for additional content) and simplify the HTML structure of your page.

    Read more


    Your <img> tags use an alt attribute

    Moreover, the alt attribute is also an important criterion for SEO. Indeed, search engines crawlers cannot parse graphic contents. That is why they use the alternative text to return consistent results, like in Google images.

    <img src="product.jpg" alt="My product description"/>

    The alt attribute is used in several cases unrelated to SEO:

    • When a screen reader is in use for accessibility purposes;
    • While image is loading, particularly for slow connections;
    • When the image file is not found.

    You have 1 img tag that defined the alt attribute.

    If nothing seems appropriate for describing an image, you might set an empty text. We advise you to make sure the majority of your images define a relevant text. Read the W3C recommendations here.

    Read more
    Cache policy 


    You do not use too long inline scripts

    Any script with a significant size should let the browser cached them in order to reduce loading time/improve performance of your returning visitor.

    Inline scripts / cache policy

    "inline" scripts allow to integrate easily small portions of scripts directly in the HTML code. Example:

    <script type="text/javascript">
        ga('create', 'UA-11111111-1', 'mywebsite.com');

    By doing so, you avoid making a request to the server to retrieve the resource. So inline scripts represent a performance gain if you want to integrate small scripts.

    However, once a script has a fairly substantial size, we advise you to outsource it and perform a request to retrieve it. So you will benefit from the cache mechanism.

    What should I do?

    Outsource your scripts with more than 1500 characters in one or more separate files.

    Read more


    This page defines <h1> and <h2> tags

    We recommend putting page keywords in at least the h1 and h2 tags. Search engines use the h1, h2, and h3 tags for SEO purposes.
    This page contains:

    • 1 <h1> element(s)

    Read more


    No frameset, frame and noframes tags detected

    These tags are obsolete, due to several issues related to the navigation consistency, SEO or browsers' bookmark features for example.

    None of these tags is detected on this page.

    The use of the iframe tag is prefered.

    Read more