Performance Question

Got an show the last days with 2 DP8ks and about 1600 LEDs in the Back... using the partly the Pixelmapper and the Effects for Background stuff. But i realized, that the Performance was nearly at the End when i edited cues. Is this normal or may it cause of a slow network. I worked o the 3.6.1. with Hog 4 and a Roadhog in as a second netnumber, and two blue DP8k's