Lazy loading

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Definition

Loading images or media only when they are about to be seen, so the first page loads faster.

Example: Only load images as the user scrolls.

Found in: school notes.

Short version to memorise (key terms bank)

Load media only when needed.

Where you'll use it in the test

Syllabus area: Y12 Programming for the Web.

Question types it can appear in

Short answer: Define, outline or explain it and tie it to the scenario.
Multiple choice: Pick the option that matches the definition or example.
Fill in the blanks: Choose this term to complete a statement or table.

Where it has appeared in the paper

Programming for the Web (Part A, C). Part letters follow each paper’s own layout.

How to use it

A model sentence

General advice, built from the definition and example above

“Loading images or media only when they are about to be seen, so the first page loads faster.” Then apply it: Only load images as the user scrolls.

In a short answer, give the definition in your own words first, then tie it to the situation in the question. Do not copy the example above unless it fits the scenario.

Command words used with it

From the linked past questions

Outline: Sketch in general terms; indicate the main features of. (2025 HSC Q16b (3 marks): Load times)
Explain: Relate cause and effect; make the relationship between things evident; provide why and/or how. (Familiarisation Q10 (4 marks): Load time)

Official worked answer

2025 HSC Q16b (3 marks): Load times (3 marks): official criteria and sample answer

Criteria

3: Outlines TWO ways, other than a PWA, to minimise load time. 2: Outlines ONE way, OR identifies TWO ways. 1: Some relevant information.

Sample answer

One way would be to provide the option to select lower resolution images or text only display. Another way would be to utilise caching as this would provide high speed access to commonly requested weather data.

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Go deeper

Flashcard: Lazy loading in Programming for the Web (Year 12) · study that set
Memorise: Web development system: front end, back end, databases
Key terms bank entry: Lazy loading
Notes: Methods to support and manage load times (Programming for the Web (Year 12))
Notes: Investigate methods to support and manage the load times of web pages/applications. (Programming for the Web (Year 12))
Notes: Design, develop and implement a progressive web app (PWA), including the application of… (Programming for the Web (Year 12))
Full term page: every question, note and marking comment for Lazy loading

Check yourself

Explain “Lazy loading” in one sentence, give an example, and name a question type that could test it.

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