What OS are you running? How is the NAS mounted? What protocol?
I run OSX and both Catalina and Big Sur are pretty bad with Samba mounts. Mac has deprecated AFS and SMB is bad. There were a few bugs in PM plus early on not dealing with disconnecting NAS drives but Kirk is phenomenal in support. I bought a license of PM plus before the discount ran out only because of him. I was confident he will fix the bugs and PM plus solves a real need for me.
There’s an app called AJA system lite on Mac that does testing of large files read and write on macs.
I get 3 MBps read on 802.11n 5GHz WiFi connected at 500Mbps and 28Mbps read when wired through GigE to the same Google wifi router. I have a ReadyNAS 104 and a 2018 maxed out Mac mini running the catalog on its primary SSD.
My NAS runs Seagate SATA 6Gb/s 3.5-Inch 4TB Desktop HDD (ST4000DM000) * 4. It’s 5900 rpm. But it’s my archival system.
My earlier machine was a custom built PC with multiple hard disks internally and not anymore.
When I moved to wired, I was able to build the catalog of 140,000 images in 3 days. It was about 10x faster but I still have one more bug with proxy building that Kirk is working on.
I thought long and hard about it. I only have two copies of images now. One in the NAS and one on the cloud (back blaze). Short of getting a NAS / DAS combination, a 12 TB desktop USB HDD provided me another local copy and quicker browsing. It was the least costly thing I could do so that helped. The HDD should arrive soon.
From what I read and benchmark, for reading large files, wifi is still very bad. PM plus has to read all the files entirely to build proxies so it’s going to be slow.
Before PM plus, I wrote my own indexing software using open source tools. I was remotely building thumbnails off the network and it took me about 20 days to just build thumbnails and copy down metadata. I started writing a search engine around it using elastic search and custom GUI but the effort involved and incremental builds of catalogs and maintaining them was a real pain. $229 was a bargain for that
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I could never get a catalog built for weeks on wifi