<r>I tried with reinstalling Java. It looked from the beginning that problem has gone but unfortunately still exists. What is interesting sometimes SweetHome works perfect, sometimes is very slow. Have no clue why it varies?<br/>
It is already 3 months since first error report and still no solution ...

<r>Guys<br/>
I did manage to cope with this problem, at least so far.<br/>
I simply installed again (without any uninstalling previous version), JAVA 3D (java3d-1_4_0_01-windows-i586).<br/>
My SweetHome3D was horrible slow, after reinstalling JAVA and restart computer (Windows 10) everything came ...