Wanted to state my findings with this.
My friend is playing on a beast intel computer, i7-2700K i think, and not sure of the GFX but its top end.
I have a AMD 8150 at 5.5Ghz on 4cores 8threads and a ATI 6970.
We have played 4 games with the default DLL, and have slow towns in late game time. Nothing too long, like 10secs? then slow for another 10secs while we are trying to do our moves.
Using this DLL, as we got into the later part of the game, there isn't as much units and things going on, so hard to really say. I think there is a small improvment. I am really too lazy to do any loads and saves and get an exact number. But it does feel like it is helping a tiny bit. But nothing to write home about.
I guess if you got a lower end machine, then this DLL switchup may help you a ton!