Describe the Common Performance Issues for User Interfaces and the Techniques to Mitigate Them. PLATFORM-DEVELOPER-II Practice Questions (Page 4)

Questions 16–20

1. 16expert · hard

   A user reports that a Lightning page is slow to load. The page contains a component that displays a list of records and another component that displays a chart. The developer notices that both components make separate server calls. What is the most effective way to improve the page load time?

   • ACombine the server calls into a single Apex action that returns both datasets.
   • BUse a synchronous Apex call for both components.
   • CUse a static resource to store the data for both components.
   • DUse a JavaScript loop to fetch data for both components.
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   A developer is building a Lightning Web Component that displays a large list of records. The component currently loads all records at once, causing slow initial render. Which technique should the developer use to improve the perceived performance?

   • AUse lazy loading to load records only when the user scrolls near the bottom of the list.
   • BUse synchronous Apex calls to ensure data is available before rendering.
   • CUse a single SOQL query to retrieve all records at once to minimize server round-trips.
   • DUse a custom JavaScript library to render all records in the DOM at once.
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   A developer wants to monitor the performance of a Lightning component in production. Which tool should be used to track performance metrics over time?

   • ALightning Inspector
   • BApex Replay Debugger
   • CSalesforce Event Monitoring
   • DChrome DevTools Performance tab
   Reveal Solution Discussion Select an answer first
5. 19application · medium

   A developer is building a Lightning component that displays a single Account record with its related Contacts. The component currently uses an Apex controller to query the data. Which platform feature should be used to reduce server round-trips and improve performance?

   • AUse a static resource to store the Account data.
   • BUse Lightning Data Service (LDS) to load and cache the record.
   • CUse a JavaScript remoting call to fetch the data.
   • DUse a custom Apex REST API to fetch the data.
   Reveal Solution Discussion Select an answer first
6. 20application · medium

   A developer wants to identify performance bottlenecks in a Lightning component. Which tool should be used to analyze network requests and JavaScript execution time?

   • AApex Replay Debugger
   • BChrome DevTools Performance tab
   • CSalesforce Inspector
   • DEvent Monitoring
   Reveal Solution Discussion Select an answer first