What makes this CSS causing render blocking?

I've been meticulously following the Google PageSpeed guidelines in order to optimize the performance of my website.

Upon running an analysis, Google provides me with a score based on their set guidelines.

There's one particular guideline that is causing my score to remain low:

It says, "Eliminate render-blocking JavaScript and CSS in above-the-fold content."

Your page has 1 blocking CSS resource which is causing rendering delays.

I have made several attempts to resolve this issue.

This includes embedding essential CSS directly into the HTML for initial rendering, as well as attempting to load CSS through an inline script.

At the end of my HTML body, I inserted the following code:

(function (document) {
    if(!document) return;
    var stylesheet = document.createElement('link');
    stylesheet.href = 'http://www.my-website.com/bundles/styles/125/core';
    stylesheet.rel = 'stylesheet';
    stylesheet.type = 'text/css';
    var head = document.getElementsByTagName('head')[0];
    head.appendChild(stylesheet);
})(document);

Despite these efforts, Google PageSpeed continues to flag this as a render-blocking issue.

Why is this happening and what steps can I take to address this problem?

Answer №1

One critical aspect is the importance of "above-the-fold content."

It is essential to make sure that the CSS you include in the head pertains only to elements located within the above-the-fold section of your website.

For instance, any CSS for your website footer should not be part of this initial load and can instead be added after the page has rendered using JavaScript.


Nevertheless, the objective is not to defer loading all CSS until the end of the document. If post-rendered CSS affects already-styled HTML elements, it will require them to be re-painted on the page, resulting in decreased performance.

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Searching for Bluetooth devices using React Native

In my project, I am working on scanning HM-10 BLE with a react-native app. To achieve this, I referred to the example provided in Scanning for Bluetooth devices with React Native. So far, the library seems to be successfully installed without any errors du ...

Guide on programmatically choosing an option within a variable with the help of jQuery

Imagine having a variable named html, which holds select options like this: var html = '<select>'+ '<option value="10">10</option>'+ '<option value="20">20</option>'+ ...

Modify the Primevue Class p-accordion-header only under certain conditions

I'm currently facing a challenge with customizing the styling of the primevue component class p-accordion-header based on the status of the rendered component determined by the variantNumber. Here's a snippet of my code: <Accordion :multiple= ...

Barba.js Revolutionizes Page Reloading for Initial Links

On my Wordpress site, I am using Barba js v.2 for page transitions. However, I have encountered an issue where I need to click on a link twice in order to successfully change the page and make the transition work. Interestingly, the first time I click on t ...

Using JavaScript to issue a Windows authentication request for Kerberos

I have created a web API with Windows authentication enabled (using IIS as well). The issue arises when my client attempts to send an AJAX request to the web API, resulting in a 401 unauthorized response. Upon further investigation, it appears that the pr ...

I'm having trouble with my AJAX Update Panel. Can someone please help me figure out what I'm doing wrong?

--------------Handling Gridviews DataBound Event ----------------- protected void grdShowCallingList_DataBound(object sender, EventArgs e) { if (grdShowCallingList.Rows.Count > 0) { foreach (GridViewRow row in grdShowCallingList.Rows) ...

The function res.sendFile() seems to be unresponsive

While building my server-side application using node.js, express, and request-promise, I encountered an issue with the res.sendFile() function in my server.js file. Despite including res.sendFile(__dirname + '/public/thanks.html'); within a .then ...

Looking to convert this single object into an array of objects within VueJS

So, I've encountered a bit of a pickle with the data from an endpoint that I need to format for a menu project I'm working on. It's all jumbled up and not making much sense right now. Any assistance would be greatly appreciated! This is the ...

Activate the date-picker view when the custom button is clicked

Utilizing this library for date-picker functionality has been quite beneficial. I am currently working on a feature that involves opening the date-picker upon clicking a custom button. The default input is functioning properly. <input name="pickerFromD ...

Unable to prolong TypeScript document

As I develop a drag and drop interface, upon dropping a file, the native File is retrieved. To enhance this interface with additional information, I decided to explore various approaches. In my initial attempt, I utilized: interface AcceptedFile extends ...

The event listener for 'ended' is triggering multiple times

I am in the process of developing a music app, and my goal is to have the next song automatically play when the current one ends. However, I am facing an issue where the EventListener seems to be triggered multiple times in succession - first once, then tw ...

Using API call responses to initiate a render in React

As a newcomer to React, I'm facing an issue with passing the results of my API call to another component file in order to trigger a render. Can anyone provide a straightforward explanation of what steps I need to take? In my code, I make a call to th ...

What is the best way to send multiple input box values to a function set in the controller?

I am attempting to send the values of two input boxes to a single controller function. <div class="container" ng-controller="MainCtrl"> <div class="row"> <div class="col-lg-6"> <input type="text" ...

How can objects be positioned or moved in a linear fashion, and how to incorporate free fall when adding additional objects?

I'm interested in creating a system similar to a "vibrating table" with linear displacement. After studying various tutorials, I was able to achieve simulations based on the following examples: Following the tutorial "Authoring a Multibody Simulatio ...

I encountered an AJAX error while working on my project

Encountering an error with my login_process.php when using ajax, preventing me from progressing. All files are stored in a single folder. Upon running the HTML log-in page, the error becomes visible. Below is the code snippet, quite straightforward. Previo ...

steps to activate button once the form is validated

Can you provide guidance on disabling and enabling a button when the form is valid? I have several conditions in my form: Name on Card: Should only contain English alphabetic letters. Card Number: Must consist of exactly 16 numbers. Expiration Month: A ...

JavaScript Function or Object: A Guide to Returning

Currently, my code is functioning as expected. However, I am curious if there is a way to modify my function so that it can be declared as an object even when no parameters are provided. Below is the mixin function in question: import Page from "@/models ...

What could be the reason why certain animations fail to run on specific icons when hovering over the parent element?

I recently launched my website which features a series of tabs with unique icons. Some of the icons, labeled as soap-icon, have animated effects while others, categorized under icomoon-icon, do not. Upon checking the console, I discovered that the animati ...

Dividing a string using regex to deal with numerical issues

My task involves processing a list of strings that look like this: Client Potential XSS2Medium Client HTML5 Insecure Storage41Medium Client Potential DOM Open Redirect12Low The goal is to split each string into three parts, like so: ["Client Potential X ...

Tips for implementing a client-side event when an asp:menu item is clicked

Currently, I'm incorporating the <asp:Menu> control into my website and populating it with data from a table in my Sql Server database using an XML data source. Now, I am looking to implement a client-side event when a user clicks on a menu item ...