System Shock Steam Deck Performance - 1.1 vs 1.2 Update Comparison - Steam Deck HQ
steamdeckhq.com
System Shock's 1.2 patch makes the Steam Deck performance significantly better, so I went in to see exactly how much it changes. And it is massive.

almost 50% better frame rates, which made playing at 90 FPS throughout the game possible on low settings and playing at Ultra quality settings at 30 FPS a possibility as well.

The game also uses less power now while running at a higher frame rate.

Controller experience is also reportedly a lot better:

The gamepad [changes] are fantastic and allow you to use the inventory menu and others much more easily, making playing on the Steam Deck 10x better.