In order to keep track of how performance is going over time here are the disk speeds of my various computers and drives.
Computer iMac Pro 2017
8TB OWC Onvoy Express TB3: Read 1457 W1327 (BlackMagic Diskspeed)
Internal 2TB SSD: Read 2443, Write 2838
G-Tech 40TB: Read 816 Write 1096 (seems oddly slow).