Sluggish event moving in Audio Part Editor with large files

As soon as start zooming in the sluggishness increases at the point that Cubase seems like freeze.

Open a large file in audio part editor (20 mins or so).
Cut it in two parts
Move away one part
Zoom in
Try to move any part…sluggish
Zoom in more for precise edit…Cubase freeze.

In Cubase 9.03 all works perfect.

Win 10 64 updated Nvidia GT 710 updated.

This thing happens even with 7 minutes long audio events…on 9.0.3 all works perfect…are nobody else having this issue?