To check if your Ubuntu 12.10 or 13.04 guest is using 3D acceleration
/usr/lib/nux/unity_support_test -p
You should see something like this
Not software rendered: no
Not blacklisted: yes
GLX fbconfig: yes
GLX texture from pixmap: yes
GL npot or rect textures: yes
GL vertex program: yes
GL fragment program: yes
GL vertex buffer object: yes
GL framebuffer object: yes
GL version is 1.4+: yes
Unity 3D supported: no
If you see “Not software rendered” and “Unity 3D supported” both say no. This means Unity is using slow LLVMpipe.
To enable 3D supported, fist you will need to update linux-headers
uname -r
sudo apt-get install linux-headers-$(uname -r)
sudo apt-get autoremove
sudo apt-get install build-essential
Now insert vitualbox guest iso from devices and to install manually
cd /media
ls
cd username
ls
cd VBOX*
ls
sudo ./VBoxLinuxAdditions.run
Insert vboxvideo to /etc/modules
sudo nano /etc/modules
Add “vboxvideo” at the end of the file
loop
lp
vboxvideo
Reboot the machine
sudo reboot
Check ”Not software rendered” and “Unity 3D supported” are enabled or not after rebooting
/usr/lib/nux/unity_support_test -p
The next thing you want to do is to increase video memory. Look for .vbox file
nano /home/username/VirtualBox VMs/ubuntu/ubuntu.vbox
Replace
<Display VRAMSize=”128″ monitorCount=”1″ accelerate3D=”true” accelerate2DVideo=”false”/>
To
<Display VRAMSize=”256″ monitorCount=”1″ accelerate3D=”true” accelerate2DVideo=”false”/>
from http://namhuy.net/951/how-to-fix-slow-performance-ubuntu-13-04-running-in-virtualbox.html