Web Development with Node.JS and MongoDB (Video 37)

The video tutorial covers the importance of page performance, methods to improve it, and tools for analysis. It explains the difference between actual and perceived performance, and how factors like images, scripts, and styles affect it. Techniques such as image sprites, script concatenation, and using CDNs are discussed. The tutorial also introduces tools like web developer tools, YSlow, and PageSpeed Insights for performance analysis.

What is the difference between actual and perceived page performance?

• Actual performance is about how fast the page loads and is ready for use, while perceived performance is about how fast it appears to the user.

• Actual performance is about how fast the page looks to the user, while perceived performance is about how fast it actually loads.

• Actual performance is about the server response time, while perceived performance is about the client-side rendering speed.

• Actual performance is about the visual appeal of the page, while perceived performance is about the technical efficiency.

How can image sprites improve page performance?

• By converting images to a vector format.

• By compressing images to reduce their file size.

• By reducing the number of HTTP requests needed to load images.

• By increasing the resolution of images on the page.

What is the purpose of minifying scripts and styles?

• To reduce the file size by removing unnecessary characters.

• To make the code easier to read.

• To add more features to the code.

• To convert the code into a different programming language.

Why should you use a Content Delivery Network (CDN) for static assets?

• To convert static assets into dynamic ones.

• To serve assets from the server closest to the user's location.

• To increase the size of the assets for better quality.

• To ensure assets are always loaded from the same server.

What is a key benefit of optimizing and compressing images?

• It increases the number of images that can be displayed on a page.

• It can reduce image size by up to 75% without losing quality.

• It reduces the image quality significantly.

• It makes images load in a random order.

Which tool provides a waterfall chart and video of page rendering?

• Web Developer Tools

• YSlow

• PageSpeed Insights

• GTmetrix

What does the network tab in browser developer tools show?

• The visual layout of the page.

• The requests made, their duration, and size.

• The HTML structure of the page.

• The list of all JavaScript functions used.