For reference, my system specs:
Ryzen 3200G 4-core, 3.6 GHz processor
GTX 1660 Super
8 GB memory set at 2933 MHz
Crucial P2 250GB 3D NAND NVMe PCIe M.2 SSD
WD Blue 3D NAND 500GB Internal SSD - SATA III 6Gb/s
On the Steam version of the game, the initial loading takes a couple of minutes. Loading any multiplayer map takes even more time, three to four minutes.
I have an Xbox One S. The Xbox One has a hard disk drive, not an SSD. It has a Jaguar-based AMD processor. The initial loading screen lasts for a few seconds. Loading maps only takes a few seconds.
By all rights, the Xbox One should not be loading the game so, so much faster than my PC, considering my specs, but it is.