SALESFORCE-PD1 User Interface Practice Question
Which THREE strategies are recommended for improving the performance of Lightning Web Components rendering large lists of data? Choose 3 answers.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Provide a unique, stable 'key' attribute (such as record Id) on each iterated element in for:each loops.
Performance for large lists can be optimized by using pagination or infinite scrolling, ensuring unique stable keys in for:each loops, and avoiding complex nested getters.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use synchronous imperative Apex calls inside template iterators.
Why it's wrong here
Synchronous network calls block rendering and are not supported.
- ✓
Provide a unique, stable 'key' attribute (such as record Id) on each iterated element in for:each loops.
Why this is correct
Helps the diff algorithm track elements efficiently.
- ✓
Implement pagination or virtual scrolling / lazy loading for large datasets.
Why this is correct
Reduces DOM node count.
- ✓
Avoid heavy computations inside template getter properties called during renders.
Why this is correct
Getters rerun frequently; heavy logic slows rendering.
- ✗
Render all 10,000 records at once in a single flat DOM tree without pagination.
Why it's wrong here
Rendering massive DOM trees degrades browser performance.
About these practice questions
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Salesforce exam blueprint
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