Moving a large group of objects

Hi all

Meet the problem with moving a large group of objects. Actually not LARGE - 372 simple shapes. But while moving the group follows to the mouse with huge delay, I have to wait 1-2 seconds before the group comes to the mouse position. If to ungroup and COMBINE those objects, everything is fine and dragging this object goes without any delay.

May be there are some settings to improve it? I use quite powerfull DELL nb, with 8 GB of RAM. Tried to change the video processor from embedded to dedicated - no results.