Sorry for the bump, but there are some things I wanna point out.
Firstly, most of the people with the problem have AMD cpus. These generally aren’t very good for gaming, and Intel is more or less better for gaming. Some people also have some intense bottlenecks from the looks of it, but I won’t point out names.
I have:
AMD FX 8320 OC 4.5 GHz
GTX 660
I can run Dirty Bomb at 50-60 frames steady on the highest possible settings, not just the High preset. Someone has previously stated that this game is CPU heavy, so i would recommend either:
Upgrading CPU
Overclocking CPU
Sucking it up until patches come
My overclock gave me a huge performance hit in TF2 and DB, because those two games are fairly CPU intensive. Some people also say they have had issues with Memory Leaks. Not sure what that is specifically, but it does destroy performance after a minute or two.
And even if the game runs on a 9 year old engine doesn’t mean it can’t look good.