A company is hosting an Amazon AP! Gateway REST API that calls a single AWS Lambda function. The function is infrequently invoked by multiple clients at the same time. The code performance is optimal,

API Gateway caching stores API responses to reduce backend invocations but does not affect Lambda initialization time when the function is actually invoked.

Provisioned concurrency keeps a specified number of Lambda execution environments initialized and ready to respond immediately. Because the function is infrequently invoked, it would otherwise experience cold starts (initialization time) on each invocation; provisioned concurrency removes this by pre-warming the environments before requests arrive.

Lambda proxy integration changes how API Gateway passes request data to Lambda but has no effect on Lambda startup or initialization performance.

AWS Global Accelerator optimizes network routing to AWS endpoints and is not applicable to Lambda functions; it does not address cold start issues.