Same for me. The game ran generally okay on my PC pre-patch with the best part being no stutter or hangs that many people were experiencing. But now ever since post-patch, menus and especially loading screens are stuttering when they weren’t before (these would usually be constant 200fps).
Also get huge frame drops from the first game I load up but will eventually even out.
PC Specs:
CPU: i5 4690
GPU: R9 290
RAM: 8GB DDR3 1600MHz
OS: Windows 10 64-bit
Installed on SSD
Everything Low settings (except for Mesh on Ultra)
Resolution Scale: 100%