E-Commerce Development E-Commerce Development Performance Optimization

Question 1

Which metric measures the time from when a user navigates to a page to when the largest visible content element is fully rendered?

Accepted Answer

Largest Contentful Paint (LCP)

Answer

First Contentful Paint (FCP)

Answer

Time to First Byte (TTFB)

Answer

Cumulative Layout Shift (CLS)

Question 2

What is the purpose of a Content Delivery Network (CDN) for an e-commerce store?

Accepted Answer

To serve static assets from geographically distributed servers closest to the user

Answer

To process payment transactions faster

Answer

To manage inventory levels in real time

Answer

To generate product descriptions automatically

Question 3

Which image format is recommended for e-commerce product images to achieve the best compression with high visual quality?

Accepted Answer

WebP

Answer

BMP

Answer

TIFF

Answer

GIF

Question 4

What does 'lazy loading' mean in the context of e-commerce product images?

Accepted Answer

Deferring image loading until the image is about to enter the user's viewport

Answer

Loading all images at page startup regardless of viewport position

Answer

Compressing images on the server before delivery

Answer

Loading images from a local cache only

Question 5

What is code splitting in the context of an e-commerce front-end built with React or Next.js?

Accepted Answer

Breaking the JavaScript bundle into smaller chunks loaded on demand per route or component

Answer

Dividing the CSS stylesheet into multiple files

Answer

Splitting database queries across multiple servers

Answer

Distributing API traffic to multiple back-end nodes

Question 6

Which database indexing strategy should be applied to an e-commerce products table to speed up filtering by category and price range?

Accepted Answer

Composite index on (category_id, price)

Answer

Full-text index on the product description

Answer

Unique index on the product SKU only

Answer

No indexes — rely on full table scans