Does everybody have the problem in this video with AmigaOS

[Ancalimon]

https://www.youtube.com/watch?v=rM6MuCc9XN0

This is an Amiga4000T with CStormPPC and CVisionPPC

MCP Solid moving windows option is enabled

The problem is that after AmigaOS3.9 boots, windows move at very low frames per second and icons behind them seem to refresh slowly.

After disabling backdrop and enabling it again, suddenly windows start to move smoothly and icons on background refresh instantly.

Does everybody have this problem? If not what could be causing this?

[Ancalimon]

EDIT: CleverWin is enabled. Unless I do not run it, I cant have smooth moving windows.

I fixed this problem by running  cleverwin before loadwb.