java controlled gridshapes with increasing lag

started building a graphics system, got stuck when i monitored a lag build-up from MOVING MY GEOMETRY. yeah, didn't get too far, eh?

the idea is that my program will output render data to a seperate computer, to be rendered on a cluster into ultra-mega HD, thus the left outlet's output.

anyway, i'd be eternally grateful if:
A) someone could tell me why there's this lag build up when you enable movement
or
B) that my lag measurement is flawed and there is no lag in outputting data

cheers,
andy