NDR regression of -7%..-15%, PDR regression of -3%..-15% compared to rls1710.
See tables in csit rls1801 report:

• https://docs.fd.io/csit/rls1801/report/_static/vpp/performance-changes-ndr-1t1c-full.txt
• https://docs.fd.io/csit/rls1801/report/_static/vpp/performance-changes-pdr-1t1c-full.txt
• search for "ethip4ipsecscale1000tnl"

There were no CSIT code changes in this area, but there were number of VPP patches, and there is another issue open related to IPSec scale with HQ QAT crypto-dev VPP-1121.

Need assistance from vpp-dev to further bisect this issue.