Better performance with Compiz Fusion in a VirtualBox VM on Windows 7

First some background.... my previous entries about VMware and VirtualBox:

Compiz Fusion and VMware Workstation 7 not playing nice:
http://orsontyrell.blogspot.com/2009/11/compiz-fusion-and-vmware-workstation-7.html

Compiz Fusion and Virtual Box 3.10 playing together:
http://orsontyrell.blogspot.com/2009/11/compiz-fusion-and-virtual-box-310.html

Today I'm seeing some great performance improvements with the latest version of VirtualBox, version 3.1.2.  Specifically I'm now satisfied with the performance of Compiz Fusion running in a VM on Windows 7.  Previous I'd see delays in the menuing system or delays when typing in a terminal window, but now the windowing performance is fine. 

After upgrading to VirtualBox 3.1.2, I upgraded the VirtualBox Guest Additions on an existing VM, and I also tested a new VM.  In both instances (an Ubuntu VM and a Linux Mint VM) I saw the same performance improvements.

Compiz Fusion and Virtual Box 3.10 playing together

Unlike VMware Workstation 7, Virtual Box can enable Compiz Fusion right out the box.  I'm impressed.  Shouldn't this have been on VMware's list?  I think they focused too hard on Windows 7 and Direct X support.  I think they're missing the boat on this one... not to mention Virtual Box is free!  VirtualBox

After a little more testing, I notice slight delays when working with windows that are semi-transparent or fade in/out of some level of transparency.  As with most things in Linux, there's probably a setting to enable/disable window transparencies.

[UPDATE]  I've tried increasing the resources, memory and cpu, but I'm still noticing a slight delays in window painting, menu refreshes, etc.  With Compiz Fusion turned off, performance is great.  Adding additional CPUs to the VM was a bit tricky.  When I attempted to start a VM with more that one CPU, I'd get an error, "vt-x is not available".  After some googling I found four setting in the BIOS that needed to be configured:
    * Security > Execute Disable (set to On)
    * Performance > Virtualization (set to On)
    * Performance > VT for Direct I/O Access (set to On)
    * Performance > Trusted Execution (set to Off)

I found the information here:  http://www.shnake.com/blog/?p=419

[UPDATE Jan 11, 2010] Fixed performance problems, see my latest post here:
http://orsontyrell.blogspot.com/2010/01/better-performance-with-compiz-fusion.html

Compiz Fusion and VMware Workstation 7 not playing nice

On a default install of Ubuntu 9.10, with 3D acceleration enabled on VMware, Compiz Fusion is not working.  :( 
"Desktop effects could not be enabled"
So it's either troubleshoot this or look at Virtual Box....

[UPDATE] I finally broke down and read the help file...  I stumbled upon this gem:
Under the section Support for Direct3D Graphics: 

Prepare a Virtual Machine for Accelerated 3-D

Before you begin, make sure the guest operating system is Windows XP, Windows Vista, or Windows 7.

Isn't that swell.

[UPDATE Jan 11, 2010] Fixed performance problems, see my latest post here:
http://orsontyrell.blogspot.com/2010/01/better-performance-with-compiz-fusion.html