SEO Engine Performance & Tuning 3

Question 1

Which technique bundles multiple CSS background images into a single file to reduce HTTP requests?

Accepted Answer

CSS sprites

Answer

CSS sprites combine multiple images into one file, using background-position to display specific portions, reducing HTTP requests.

Question 2

What does the 'defer' attribute on a script tag do?

Accepted Answer

Downloads the script in parallel but executes after HTML parsing

Answer

The defer attribute downloads the script without blocking HTML parsing and executes it after the document is fully parsed.

Question 3

Which Google tool measures real-world Core Web Vitals data from actual Chrome users visiting a site?

Accepted Answer

Chrome User Experience Report (CrUX)

Answer

CrUX aggregates real-world performance data from opted-in Chrome users and powers the 'field data' shown in PageSpeed Insights.

Question 4

A CDN (Content Delivery Network) improves SEO performance primarily by:

Accepted Answer

Serving assets from edge nodes geographically closer to users

Answer

CDNs cache and serve static assets from edge servers near users, reducing latency and improving load times and TTFB.

Question 5

Which resource hint tells the browser to establish a connection to a third-party origin in advance, including DNS, TCP, and TLS?

Accepted Answer

preconnect

Answer

Preconnect performs the full connection handshake (DNS + TCP + TLS) in advance, unlike dns-prefetch which only resolves DNS.

SEO Practice Test