reply to sk1939
Re: [H/W] VS-S720-10G-3CXL Can you provide interface configuration information for the interface vlan's? There is nothing security related in those. Confirm that proxy arp is disabled, no ip redirects, no ip directed broadcast, etc. Anything there that could possibly be an obvious source of additional processor time. (on top of all the other showcmds and troubleshooting from the link above)
I can try.
We do have proxy arp disabled, but ip redirects and directed broadcast traffic are used (at least to my knowledge).