Describe the Common Performance Issues for User Interfaces and the Techniques to Mitigate Them. PLATFORM-DEVELOPER-II Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A user reports that a Lightning page takes a long time to load. The page contains multiple components that each make separate server calls. What is the most likely cause of the slow page load?

   • AExcessive network requests due to multiple server calls from each component.
   • BBlocking JavaScript in the components.
   • CLarge data volumes in the database.
   • DInefficient SOQL queries in the components.
   Reveal Solution Discussion Select an answer first
2. 2expert · hard

   A developer is troubleshooting a Lightning component that displays a list of 10,000 records. The page loads slowly, and the developer suspects the issue is due to the amount of data being rendered. The component uses a SOQL query that retrieves all records and renders them in a table. Which combination of techniques would best address the performance issue?

   • AUse a single query to retrieve all records and render them in a virtual scrolling list.
   • BUse a JavaScript loop to render each record individually.
   • CImplement pagination and use a selective query with an indexed field.
   • DUse a query that retrieves only the fields needed and cache the results.
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   A developer notices that a Lightning component that displays a list of Cases is slow. The SOQL query filters on a custom field that is not indexed. What is the most effective way to improve query performance?

   • AUse a query that filters on a formula field instead.
   • BAdd a custom index on the custom field used in the WHERE clause.
   • CUse a query that orders by the custom field to improve filtering.
   • DUse a query that selects all fields to avoid index lookup.
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   Which of the following is a root cause of UI performance issues in Salesforce?

   • ACaching static resources
   • BSelective queries
   • CLarge data volumes
   • DUsing server-side actions
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   Which technique helps mitigate UI performance issues by deferring the loading of non-critical resources?

   • ALazy loading
   • BBlocking rendering
   • CSynchronous calls
   • DEager loading
   Reveal Solution Discussion Select an answer first