What I found odd is in "Get to the River" the action was rather jittery and became less so as I killed off the bad guys and watched the AI gauge decrease, however, I made a simple level with over 100 of them (to run a stress test) and it wasn't jittery at all. Anyway, glad to hear it's getting better!
MAME Cab PC: i7 4770@3.4Ghz (passmark 9945), 12GB RAM, Win 8.1/64, GeForce GTX645 (passmark 1898); Shiny new laptop: i7 4800MQ@2.7Ghz (passmark 8586), 16GB RAM, Win 8.1/64, GeForce GTX870M (passmark 3598); Old laptop: i5@2.3Ghz, 8GB RAM, Win 7/64, Intel 3000 graphics