The Raspberry Pi 1 struggles with NFS over TCP, if you want to get the best performance on a Pi 1 I would actually use UDP.
Your rsize and wsize are also rather large, I would drop them to 8192 for UDP.
I would simplify your NFS line a lot, you have a lot of unnecessary stuff, try something similar to this:
moorea:/export/Films /mnt/Films type nfs vers=3,rsize=8192,wsize=8192,udp,retrans=2
NFS should be performing better than SMB, not much worse.