JWT authorizer causes unexplained latency overhead in HTTP API Gateway

HTTP API Gateway with Lambda integration shows ~600ms gap between integration latency (sub-40ms) and total latency (612-647ms). Issue persists on both cold and warm Lambda starts despite JWT authorizer token caching being expected to work (2-hour cache for IDP keys, caching of authorization decisions for repeated tokens).

Monitor CloudWatch metrics to confirm Latency vs IntegrationLatency discrepancy. Test removing JWT authorizer temporarily to isolate issue. Verify JWT authorizer caching is functioning (should cache IDP keys for 2 hours, should cache authorization decisions for repeated tokens). Confirm resource-based policy exists on Lambda to avoid STS call overhead. Consider REST API instead of HTTP API if X-Ray tracing needed for deeper debugging. Enable detailed CloudWatch logging and metrics for additional visibility.