LWC Security and Performance

Lightning Web ComponentsLWC Security and PerformanceHow Lightning Web Security and Lightning Locker sandbox your code, how CSP and Trusted URLs control what you can load, how to avoid XSS and over-exposed Apex, and how to make components fast: LDS caching, cacheable Apex, lazy loading, large lists, debouncing and profiling.Advanced · about 80 minutesWhat you will learn

Explain how Lightning Web Security differs from Lightning Locker and how to enable and debug it

Load third-party libraries safely via static resources and configure Trusted URLs (CSP)

Identify and prevent XSS risks from lwc:dom="manual", innerHTML and URL handling

Design secure Apex endpoints for LWC, including guest user exposure

Apply caching, lazy loading, pagination and debouncing to keep components fast

Measure performance with EPT, the Lightning Usage App and Chrome DevTools, and prevent memory leaks

Contents

Part 1: Security

Part 2: Performance

Worked example: hardening and speeding up a "Customer 360" panel

Security and performance checklist

Common pitfalls

Hands-on exercises

Key takeaways