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Engine Performance & Tuning Flashcards

7 cards from real SEO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Engine Performance & Tuning flashcards as text

  1. What is the purpose of the 'preload' resource hint in the HTML ?

    Answer: Fetch a critical resource earlier in the page load cycle

    Preload tells the browser to fetch a specific resource early because it's needed for the current page, improving load performance.

  2. Which metric in PageSpeed Insights represents the time until users can reliably interact with the page, not just see it?

    Answer: Time to Interactive (TTI)

    TTI measures when the page's main thread is quiet enough for reliable user interactions, beyond just visual readiness.

  3. A website uses third-party fonts from Google Fonts. Which approach MOST reduces the performance impact of these fonts?

    Answer: Self-hosting fonts and using font-display: swap

    Self-hosting eliminates the third-party DNS lookup and connection, while font-display: swap prevents invisible text during loading.

  4. What does 'Total Blocking Time' (TBT) measure in web performance?

    Answer: Sum of time the main thread is blocked for more than 50ms between FCP and TTI

    TBT sums up the blocking portions of long tasks (over 50ms) on the main thread between FCP and TTI, indicating interactivity issues.

  5. Which of the following is a common cause of Cumulative Layout Shift (CLS) on web pages?

    Answer: Displaying ads or embeds without reserved space

    Ads, embeds, and dynamic content that load without pre-reserved dimensions push existing content down, causing layout shifts.

  6. In the context of SEO performance, what is 'critical CSS'?

    Answer: The minimum CSS required to render above-the-fold content

    Critical CSS is the minimal subset of styles needed to render the above-the-fold viewport, inlined in to avoid render-blocking requests.

  7. A site's mobile PageSpeed score is significantly lower than its desktop score. What is the MOST likely primary cause?

    Answer: Lighthouse simulates slower CPU and network throttling for mobile

    Lighthouse applies CPU throttling (4x slowdown) and network throttling (Slow 4G) for mobile audits, simulating real mobile device constraints.