What performance metric should you monitor when implementing lazy loading?
Time to Interactive (TTI) and loading delays are crucial metrics to monitor when implementing lazy loading because: 1) They directly reflect the user experience impact of your lazy loading strategy, 2) Help identify potential bottlenecks or excessive loading delays, 3) Provide insights into the effectiveness of your code splitting decisions, 4) Allow you to optimize the balance between initial load performance and on-demand loading. Monitoring these metrics helps ensure that lazy loading actually improves rather than degrades user experience, and helps identify opportunities for optimization through techniques like preloading or adjusting chunk sizes.