[Lazarus] In windows 10 (64bit) Assigning TFrame.parent to a TForm took 10 more seconds than Windows 7 (64 bit)

[Dennis]

I am using FPC 3.1.1  + Lazarus 1.9.0 running on windows 10 (64 bit) to 
generate windows exe of 64 bit.

I logged the timestamps before and after parent assignment in my     
constructor TMyFrame.CreateWith(aForm : TForm);
....
MyFrame.Parent := aForm (where aForm is the main application window).
......


In windows 10 (64 bit)
18-12-19 00:06:10.154 Before Set parent( old parent = nil )
18-12-19 00:06:23.983 After Set parent

it took 13.9 seconds

In windows 7 (64 bit)

18-12-19 00:07:45.916 Before Set parent( old parent = nil )
18-12-19 00:07:48.939 After Set parent
it only took 3 seconds.

what could possibly be the cause of the extra 10 seconds in windows 10 ?

The hardware is same. In fact, the windows 7 (64 bit) is a virtualbox 
running on the windows 10, so it should be slower.

Dennis
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