A company operates a blog post application on AWS, utilizing Amazon API Gateway, Amazon DynamoDB, and AWS Lambda. The application currently lacks API key authorization for requests. The API endpoints include: GET /posts/{postId} for retrieving post details, GET /users/{userId} for fetching user details, and GET /comments/{commentId} for obtaining comment details. The company has observed active discussions in the comments section and aims to enhance user engagement by making comments appear in real time. Which architectural design should be implemented to minimize comment retrieval latency and improve the overall user experience?