Choppy Gameplay After Engine Error

Summary:
Upon loading up my save, I get an engine error. Which seems to cause the game to run slow and choppy after dismissing the error. My save was made in Alpha 17 but before the 593 release, it started doing this after said release.
Steps to reproduce:

  1. Make save in Alpha 17’s release state
  2. Update to Release 593
  3. Load game

(I highly doubt that’ll reproduce but that’s all I did to get it, I don’t know if something else was going on mid patch.)

Expected Results:
No error, smooth gameplay
Actual Results:
An error, choppy gameplay
Notes:

Attachments:
Engine Error Report (Pastebin)
Version Number and Mods in use:
Release 593, no mods
System Information:
DxDiag (Pastebin)