LWCBeginnerperformancebest-practices
What common LWC performance mistakes should beginners avoid?
Real World Scenario
A datatable component loads thousands of rows and freezes the browser. You list beginner performance tips.
Expected Answer
• Load only needed fields in getRecord and Apex queries
• Paginate large lists instead of rendering thousands of DOM rows
• Avoid imperative Apex calls inside loops in renderedCallback
• Use @wire cacheable reads where data does not change every second
• Debounce search inputs before server calls
Follow-Up Questions & Answers
Click to expand — each follow-up includes a direct, interview-ready answer
Multiple wires can run in parallel but still add network calls. Consolidate related data in one cacheable Apex when wire limits hurt.
Architect Perspective
Pagination and field minimization—concrete fixes beat vague "optimize JavaScript."