Tip to keep minimum framerate higher "Disable C-States" either by Bios or ThrottleStop before gaming.

[DesSanctYew]

If you "Disable C-States" it can help a little bit which can be done via bios or toggled on or off with a program called ThrottleStop. Basically you'll gain a good 100MHz roughly better performance than you would otherwise due to CPU multiplier fluctuating back and fourth between min and max settings.

What happens is the settings causes the CPU to try to lower the multiplier to idle multiplier whenever possible and unless a program specifically utilizes 100% CPU load all the time which is rarely the case outside of a few benchmark programs.

Since this game is very single thread CPU speed dependent I'd recommend you disable C-States before playing so CPU will stay at your CPU max multiplier settings. This doesn't mean it'll use 100% CPU load it just means it'll operate locked to your highest multiplier setting consistently.

I'd recommend this tweak for all games that don't run flawlessly at your monitors refresh rate or min frame rates dip below 60FPS particularly if you use VSync. The reason is that it will help slightly in keeping your min frame rate higher.

[stylez]

You can easily see with a utility like Open Hardware Monitor whether or not this would make a difference.

So far I have not seen the CPU speed stepped down while the game has focus, even when the game is paused it is still keeping the CPU at 100%. As soon as I alt-tab out of the game, my cores go back to fluctuating speed as needed.

[DesSanctYew]

In windowed mode it's easy to notice it happening, but you'll probably need to lower game resolution temporarily if your worried about CPU backround/foreground focus impacting it.

You can even notice within ThrottleStop itself so long as your not runing TS Bench. Here take a look all I did was hit print screen a few different times to illustrate how it changes then posted results side by side for illustration.

http://s127.photobucket.com/user/knowom/media/Benchmarks/C-States%20-%20Enabled_zpsnze6pplq.jpg.html

I lose about 1-2FPS AVG from enabling it versus disabling it with ATITool. I know that's not a whole lot, but it does show it impacts FPS a bit which ultimately will hurt your minimum frame rate similarly in not worse because it's less predictable since fluctuates and isn't averaged. It's even helping with DPC Latency Checker for me marginally keeping it 1-2us lower and keeping it's average latency down a bit.

I don't know what more proof you need it does make a difference it's not significant, but it's free and can help some people particularly those struggling with minimum frame rates and or micro stuttering.