I've got a QNAP TS-462 with 16 GB RAM that's been behaving poorly with recent QTS updates. I'm backing up everything to external disks now to redeploy it, and have brand new 2x 8 TB disks to start fresh but now I've got the option to stick with QTS and deploy fresh, or switch to UnRaid.

UnRaid is looking really appealing, but the one thing I'm wondering about is read speeds, and whether or not it might be an issue. My NAS is mostly archival, I copy things back and forth periodically, but most of it is reads, not writes. That's great with the mirroring of RAID1 to my understanding, and I know it will be slower with UnRaid. But I'm wondering how much slower, and if a nvme cache disk will be enough to mitigate potential issues.

My network is only 1GBit. My router is capable of 2.5Gbit but I don't currently have devices that could take advantage of that except the NAS. Would the reduction in read speed since the disks aren't mirrored be an issue? Is the pool with parity something akin to how RAID5 works? I'm pretty new to this, have been researching the last week or two, but haven't been able to find clear answers regarding the performance so figured I'd ask here.

Thanks!