SE2 [BUG] 7H Gameplay Vs System Memory (I have 64Gb DDR5)

I've hit this bug 2x in a row, when you/I start the game, it starts at ~8 - 9GB Memory usage. Soon as you get close to the 7 hour mark the game gets sluggish/Laggy when I checked the Task Manager, the game memory was close to 16GB (My full system specs below).

I did a Save, exited to the main menu and loaded the save, the lag was worse? I then Exited the game, waited for the game to stop (the right way), then reloaded the game and the save, the lag was gone.

With the amount of RAM I have I was a little baffled, then I thought: It could be something with this blasted GDPR Violating O/S (Read MS's Privacy Policy for more details) or the game is capped at 16 GB and goes weird if it isn't allowed to go beyond it.

Full System Specs:

O/S: Windows 11 Pro 64bit

Motherboard: MSI Mag Z790 Tomahawk WIFI (Wireless and Bluetooth 5.2 which are disabled for security reasons).

CPU: i7-14700 (14th Generation, 20 cores)

RAM: 2x 32GB DDR5 5600Mhz

M.2: 1TB M.2 Solid State drive (O/S only)

SSD: 1TB, 2TB & 4TB Samsung 870 QVO drives. (4TB has all the games and programmes on it).

HD: 2x 2TB SATA's

GPU: 12GB Nvidia RTX 4070 Graphics Card

Optical: Pioneer Blu-ray RW up to 50GB per disc

Soundcard: Creative Sound BlasterX AE-7 Plus Pure Edition

PSU: Corsair 1000W Gold Rated Modular

2x G-Master (iiama) GB3261UHSCP Monitors