Problem in VirtualBOX.

I got a problem in VirtualBOX, hope someone can help me.
Why is my mouse (or touch pad) response sluggish when I installing the Window 7 (or Ubuntu 10.4) in VirtualBOX ?
the host OS works fine but VirtualBOX.
I share 4GB memory and 128MB video memory to VirtualBOX, is it any setting I should change ?
PS : My NB is Macbook Pro 15" i7. (8GB memory)
Thanks in advance ~ ^^

I have used VB on my MBP for some time and have Win7 (64bit), Win2000 and Ubuntu virtual machines all working well.
I suspect that you may have allocated all CPU cores to each VM. I found that will cause the whole machine to become sluggish. I reduced the numbers of cores to: Win7, two (of four on my MBP), and; Win2000 and Ubuntu, one each.
Of course, only have one machine, including the MBP, doing heavy processing at once.
Also keep in mind that installing an operating system is CPU intensive.
Hope that helps.

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