iMac Pro seems to underperform on reading & writing large files
I'm working with a client with a 2017 iMac Pro running 10.14.6. It's got a 3 Ghz Intel Xeon W Processor, 64GB RAM, and a 1TB SSD.
He works with gigantic photography files and bought this machine for that purpose. I'm currently testing photoshop where he's got a 15GB large document format (psb) file open. As a simple test we are saving a new copy of the file in photoshop to the desktop. The drive is rated at about 2.5-3 GB/s read and write speeds, and as I write this it has saved only 29% at the 6 minute mark (38% at the 8.5 minute mark). If my math is correct the whole file should be done in 5-10 seconds tops?
Took it to Apple and they were unable to determine any issues during their diagnostics, and simply wiped the machine and sent it back. We now have a vanilla copy of Mojave on here with basically nothing installed except for Photoshop CC.
Is there any recourse? What could be wrong? Please advise fellow geeks1