For a while I've had ~28,000 images accessed through LR across a gigabit LAN to a ReadyNAS (from my Macs). About as many again on local (Firewire RAID) disks. On the whole it's been reasonable to work with the NAS, but while the data throughput is comparable to FW400 (i.e. faster than USB2) the directory lookups have been significantly slower.
With a NAS there are lots of issues/variables: the performance of the NAS software and hardware; the per-packet latencies introduced by the networking hardware you're using; the throughput/bandwidth of the network; the per-file latencies introduced by whatever networking protocol you're using; etc.
Local disk has very low latencies, and will almost always be faster, especially when dealing with lots of files.
1 minute per file does sound as though your NAS setup has serious issues though...
I've recently migrated my working set of images off the NAS to other RAID storage in search of more speed, but a NAS
can work OK.
Best not to work off any network drives in LR. Only USB 2 or Firewire 800 - only local drives..... this also makes your photo library more portable, a good thing.[a href=\"index.php?act=findpost&pid=191548\"][{POST_SNAPBACK}][/a]
Actually, I'd recommend direct (S/PATA and SCSI) drives, FW800, FW400,
then USB2, in that order of preference. But anyway...