Optimizing web performance and critical rendering path

Name: Optimizing web performance and critical rendering path
Price: 9 USD
Availability: InStock

1h 16m 17s

English

Paid

October 31, 2024

Performance is a very important aspect of every web application. Web page should be loaded as quickly as possible and the animation should flow smoothly. People are very sensitive to any kind of motion. For any kind of visual change on the screen, like scrolling, hover effect, opening the sidebar etc., the browser is going to render a new frame onto the screen. When rendering of the frame takes longer, the frame rate drops, and it negatively impacts the user experience.

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Low frame rate will create a poor user experience. For this to happen, there doesn’t need to be some complex animation, it can happen with just a regular page scrolling!

I am pretty sure that you already had experience with websites that have a low frame rate, which causes that “laggy” animation? You click on something, open the sidebar and the whole page is lagging. Or even worse, you might have noticed that you have a laggy experience when scrolling the web page. Scrolling doesn't seem like something you had to think about from the performance perspective, but you should. Therefore, in this course we will be talking about fixing the performance issues and so, you might expect that this course is about JavaScript…but surprisingly – it’s not. This course is about CSS. A lot of developers think that as long as JavaScript runs well, there's nothing else left to do for the performance optimization. JavaScript has a great impact on the performance of the website, however CSS is unjustly neglectred in this area. In many situations CSS might be the only problem.

There’s another very important impact that CSS has on the webpage.

CSS is render blocking (by default). The browser will not begin to render the page until all CSS has been downloaded. Any delays on the Critical Rendering Path will leave users looking at a blank screen. CSS is truly critical if you want to have a fast loading page. Sometimes, just to parse CSS file it takes more than 500ms. Just to parse, without network – just a single CSS loaded from a hard drive will cause users to see only a blank screen until the parsing process is finished.

Optimizing the performance your website may also have an impact on the google search result ranking algorithm.

In this course we will show you CSS in a new light.

Requirements:

At least the basic knowledge of web development
At least the basic knowledge of CSS

Who this course is for:

Intermediate front end developer
CSS developer

What you'll learn:

How the browser renders the frame
The effect of CSS properties on the rendering of the frame
How and why should you promote an element into a layer
Choosing the right CSS properties for animation
Understanding and fixing the paint issue
Improve the critical rendering path

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#	Title	Duration
1	Introduction	04:15
2	Prerequisites	01:28
3	Introduction	02:55
4	Style Calculations	03:19
5	Style Calculation Demo	06:05
6	Layout	02:26
7	Paint	02:32
8	Update Layer Tree	01:46
9	Composite Layers	02:49
10	Summary	00:56
11	Introduction	01:21
12	FPS	02:14
13	The Performance of style calculation	04:30
14	Running Performance Issue	02:42
15	Paint Profiler	01:17
16	Performance Analysis	03:16
17	How layers work	02:08
18	Creating a new layer	02:02
19	Multiple Layers	01:58
20	Older browsers	01:55
21	Properties impact	04:31
22	JS vs CSS	01:52
23	Summary	00:32
24	Introduction	02:32
25	Parser Blocking JavaScript	02:02
26	Render Blocking CSS	02:18
27	Imports	01:39
28	Non Render Blocking CSS	02:09
29	Unused Styles	02:15
30	Base64	01:55
31	Minification and Gzip Compression	02:06
32	Summary	00:32

Course