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I suspect it more to do with your storage than anything. Run your import again and sample your I/O performance from your NFS server during the import. Also, if you can... .create LACP bond on your NFS server. I don't know what kind of throughput you expect but remember. A single GB nic can only do a max of 125/MB a sec. That sounds rather good but take into consideration everything you're doing across your environment... its not a lot. I see well over 400 mb/sec network throughput at times on my storage. I run bonded 10GB nics.
Once you get your templates and such built you shouldn't experience that much NFS I/O. You should allocate enough memory to your guest as to avoid virtual disk paging on your NFS storage.