VMFS access is slow (unload VMFS-2 & NFS drivers)

When using several VMFS 3 datastores, there is no need to use the VMFS 2 driver. You can unload the driver with the following command :

vmkload_mod -u vmfs2

Also, if you are not using (or planning to use) NFS datastores, you can also unload the NFS driver with the following command :

vmkload_mod -u nfsclient

In my (growing) lab environment the performance improvement was considerably.