I have a quad processor so I can't tell you specifics on a dual but I was startled when I came to visit the forum and I saw the heading as well as the rejoicing that the English version has been released.
Downloaded, installed, affinity is working exactly the same as the Russian version. I ran one of the combat training missions and got a ~30-40% bump by setting the affinity to 1,2,3 cores - I always deselect cors 0, it's likely busy running a number of OS tasks. Same results as the Russian version.
I'd suggest the only differences between the two .exe's is the language so I wouldn't have expected any different.