well, that could be your problem. i had the same problem on my edge. i had a 6 " extension on the cahnnel 7 servo, and it also lagged, but only during the range check. so for all my servos, instead of using extensions, i cut the servo leads and solder a new piece inbetween so it is one long lead coming from the servo. i do this for all my servos anytime i need an extension. the more connections you have, the more voltage you loose. and that long of a lead, it could loos a lot of voltage on the way to the servo. thats all i can think of, if any one else has any other ideas, please post em.