Which feature enables FortiGate devices to process traffic more efficiently?

The feature that enables FortiGate devices to process traffic more efficiently is load balancing. Load balancing distributes incoming network traffic across multiple servers or devices, which allows for an optimal use of resources, minimizes response time, and prevents any single resource from being overwhelmed. By spreading the traffic load, FortiGate devices can maintain higher performance and reliability, enhancing the overall efficiency of traffic processing.

While the other options provide useful functionalities—such as asynchronous processing, which allows for more efficient use of CPU resources, content caching that speeds up data retrieval, and traffic shaping that manages bandwidth allocation effectively—they do not directly focus on ensuring that the processing workload is evenly distributed. Load balancing specifically addresses the need for efficiency in handling high volumes of traffic, making it a key feature for improving network performance in FortiGate devices.