nfsstat authrefrsh almost equal to calls

Question

I mounted a dir from my server through nfs (v3) on my LAN and if I run nfsstat I get

# nfsstat -rc
Client rpc stats:
calls      retrans    authrefrsh
2527772    0          2527782 

Is this something that is going to affect performance?

My mount options in fstab are just

noauto,relatime,noexec

And the export file is using

(rw,sync,no_subtree_check)