2) The CPU only needs to call the function pXent_addforcecentral once, instead of two times.
Hm, but the function is only called, if the key is pressed, isn't it!?! So normally only one key is pressed ... and all times when none of the keys is pressed, it has to call the function not at all.
That said, it doesn't matter which way you choose as the time isn't measurable for a human (for really, really, high precision timers its measurable, but your brain will fail this challenge).
-> my argument of "in sum" (à la "Die Summe macht's!") [haha, three languages in one sentence
] !?
