I experience FPS drops from time to time on certain CW maps. Some maps lag, some don't. Don't know the reason. Looks like something is loading up from HDD, but I have 8GB of RAM and 2GB of VRAM - should be enough, considering I'm playing with not maxed out settings. Tried to lower the textures to medium. Same drops.
Ingame it looks like this:
or this:
CPU is Intel Core i5 4210H (2 physical cores, 4 threads), It's pretty much enough for stable ~30+ fps.
GPU is 2GB GeForce GTX860M. Not much powerful, but MWO depends on CPU more, then on GPU. Also, I have almost all settings minimized except for textures and couple of others:

So, what's the problem? As for now I think only of bad coding by PGI. Any thoughts/suggestions?