OpenDialog hungsup whole virtual machine

[krzynio]

Hi!
Lazarus trunc, W10 x64 on Virtualbox.
Since I upgraded W7 to W10 applications written in Lazarus slow down or even hung-up the system when I am opening the TOpenDialog or TSaveDialog component. It is especially visible in runtime environment.
I think that it must be related to any system setting like thumbnails or network drives but I cannot find the problem and fix it. The same applications developped under Linux or on Windows but already compiled and starded outside of Lazarus environment works fine. Any suggestions?

[RAW]

No not really, but I recognized there is a different opening speed if I use an OPEN DIALOG on W7x64 inside a x86-EXE. That's a lot slower than using a x64-EXE.
Even on my Celeron Notebook (1,7 Ghz x1) with only 500 MB RAM the OPEN DIALOG starts faster with a x86-EXE.