FPGA devices can be used in a design to perform some high speed operations for the processor.  This is done to achieve high performance or handle hard realtime tasks that require results in a tight window of time.

Field-Programmable Gate Arrays (FPGAs) are highly effective for embedded systems because they offer a unique middle ground between the general-purpose flexibility of software and the high-speed performance of dedicated hardware. Unlike traditional microcontrollers that execute instructions sequentially, FPGAs utilize a parallel architecture, allowing them to handle multiple complex tasks simultaneously with extremely low latency

Hardware Parallelism: FPGAs can process massive amounts of data in parallel, making them ideal for high-bandwidth applications like video processing, image recognition, an

Post-Deployment Reconfigurability: You can update the hardware logic in the field via software. This extends product longevity by allowing systems to adapt to new standards or fix hardware-level bugs without physical replacement

Customization & Offloading: They can act as hardware accelerators for a primary CPU, offloading computationally intensive tasks like cryptography or complex signal processing to improve overall system efficiency