I went watching television for about 5 hours, when I got back the fan of this laptop was doing some heavy work.
When I opened task manager it was again a java.exe that was peaking.
Not sure if it was opened by B4A so I took a deeper look at the problem.
In the attachment you can see that B4A for some reason calls java.exe,
this happends every half a minute or so but since there are 2 code/ide sessions this happends twice in a minute so it's like 50 seconds 100% cpu and 10 seconds 0% cpu. then the cycle starts again.
I didn't touch the B4A since I returned, took the screenshot and posted this reply.
So it's doing stuff in the background without a usefull reason.