I have the following issue.
I have windows 7 installed on my laptop and I am running virtualbox with a ubuntu virtual machine. The problem is that when I try to run flash .e.g. youtube the performance of the video is cra*. Both video and audio are very laggy. Although I have a relatively powerful pc. Details: Intel i7-2670QM, 8GB of ram, Nvidia GT 540M 2GB - vc
On the virtual box I've given 8 cpu's and 5GB of ram. Enabled 3D acceleration and 128MB of video memory.
I have installed the guest additions.