Poor graphics performance on Macbook Pro with windows 7 bootcamp
I have a 13" Non-Retina Machbook Pro with Intel HD 4000 Graphics, purchased around 2 years ago. I installed Bootcamp for certain assignments for school, running Windows 7, and started playing videogames on it. I played Dark Souls and Chivalry, mainly, and both ran reliably at a pretty mediocre framerate but with decent graphics settings. I picked up Dark Souls 2 in the summer, and was able to run it and medium-high graphics with decent framerate. several months later, after not having played on Windows for a while, I came back to Dark Souls 2, but found that the game would run with this strange, pulse-y lag, like everything would animate quickly for a moment before pausing and continue again. the framerate itself was normal, it would just stutter constantly. (about one pause per second) and it wasn't a complete freeze, either. The game would move very slowly for a moment instead of freezing.
Anyway I was surprised and decided to test it with Chivalry. Same Problem. Kingdoms of Amalur, same problem. All of these were windows only so I decided to compare something that could run on both platforms. I tested it with league of legends - Mac side: Medium-high graphics with 60 fps. Windows side: Low graphics with pulsing lag and 30fps.
I read through some articles and found something about SMC reset. Tried that. No effect.
Then I updated my drivers. No effect.
Any idea what's wrong with my windows-side graphics?
MacBook Pro, Windows 7