Thanks guys for your responses. I want to be able to update the servo positions all at once. I am using the servo's in continuous rotation and need to minimize lag between issuing commands to the modified servos. The platform vehicle I am working on needs to have synchronized motion of all 4 servos attached to wheels.

A colleague suggested to use a PICAXE which has a SERVO command that allows up to 8 servo's at once. The output pulses to all the servo's start at once (obviously some pulses will be shorter than others depending on position 1 ~ 2ms). There has to be a way that I can do it on a PIC without assembly.....the scope of this project is too big to spend all my time on assembly code.