1. Start up game using 64 bit exe
2. Begin play as normal
I use MSI Afterburner to monitor CPU/GPU Temps, FPS and GPU Usage.
3. Experience the 1 FPS Bug (Conditions as to why this happens are unknown to me)
4. Experience severe lag, stuttering and effectively 1 FPS. I distinctly notice that the game is no longer using the video card as usage is noted at 0%.
5. After approximately 2-4 minutes the game finally recovers.
6. Begin to play again, continuing to loot up.
7. Notice that Video card usage was markedly down with usage ranging from 55-65% typically and maxing out at ~84%. The subsequent FPS rates were effectively halved compared to FPS rate prior to the 1 FPS Bug. (Prior to the 1 FPS Bug video card usage was maxed at 100% and temps were steady at 65-70 deg C).
8. I proceeded to run around a bit to see if I could drive the Video Card usage back up to 100% without any luck.