I have delay in opening faceplate take from 1.5 seconds to 3 seconds

I make upgrade from the system 4.1 to 6. 0.3 through system 5.1 by using migration tool to change graphic from Vb to pg2
The system is with advant AC450
In workplace structure when open faceplate it delay for 2 seconds
Also when open some trend the system hangs up
I check the diagnostic of the graphic in its normal
I don't know how solve this problem