VMware vMotion Stun Times

Hi,

we are currently testing HPE DL385 Gen10 Plus servers equipped with T4s. Those are connected directly via two 25Gb Mellanox NICs for vMotion. Installed is ESXi 7.0 U2.
Unfortunately the stun times are higher than on the production servers running two 10Gb connections.
How can I further troubleshoot this issue?

Thanks