Another workaround is blacklisting the 'rpcsec_gss_krb5' kernel module
(in /etc/modprobe.d/blacklist.conf) -

# Blacklist rpcsec_gss_krb5 kernel module; needed for quick NFSv4 mounts, ref. 
bug https://bugs.launchpad.net/ubuntu/+source/nfs-utils/+bug/1270445
blacklist rpcsec_gss_krb5

But obviously the NFS subsystem should not be attempting to load this at
all if the system isn't using Kerberos (i.e, no Kerberos keytabs or
krb5.conf files)

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https://bugs.launchpad.net/bugs/1270445

Title:
  slow NFS4 without "NEED_GSSD=yes"

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