Originally Posted by Ramurd
looks like your videocard cannot keep up or does not get it's data provided fast enough. We don't really get enough information:
- how busy does your host get?
- how much memory do you have free on the host?
- is there (any) waitio involved?
- how high is the cpu-load on the host machine? (I think virtualbox video is rendered on the cpu rather than on the gpu)
You are right it was the memory issue!
I remembered that about a few weeks ago due to some memory problems I had to remove 1GB faulty memory from my machine. Still, I forgot to change the base memory allocation in the VirtulaBox settings (stupid mistake). As a result 760MB was allocated for the VirtualBox on a 1GM machine.
After reducing the VirtualBox base memory to 440MB, the host desktop behaves normally again.
So I believe this issue is solved now.