TCP Chimney (sometimes referred to as TCP Offloading)

This feature is designed to take processing of the network such as packet segmentation and reassembly processing tasks, from a computer’s CPU to a network adapter that supports TCP Chimney Offload. This has the effect of reducing the workload on the host CPU and moving it to the NIC, allowing both the Host OS to perform quicker and also speed up the processing of network traffic.

You can disable the features in the NIC properties of most NICs, however the naming convention and exposure of these settings varies from NIC to NIC and also from driver to driver.