This DisplayString is the cumulative byte count encrypted by the dedicated IPsec NIC, per 'IPsec NIC: Encrypted bytes by NIC.' It's the outbound counterpart to cpvIPsecNICDecrBytes, so tracking both over time on a busy VPN hub confirms the hardware path is scaling with traffic growth rather than plateauing while overall VPN throughput keeps rising. A flattening of this counter's growth rate while total VPN traffic keeps climbing would suggest the NIC has hit a throughput ceiling and traffic is spilling over to software encryption.