Short summary: 14.04 is much slower than 12.04 even with more RAM assigned.
I'm using latest VirtualBox 4.3.10 on Mavericks 10.9.2. How can I make it faster?
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Also, I found the following helped for me. Enable the use of the Host IO cache for the SATA controller for the virtual disk.
Run Oracle VB Select your VM on the LHS Settings -> Display - > Video tab, "Enable Features:" and check the Enable 3D Acceleration box Click OK
Disabling the background blur of the search panel with the Unity Tweak tool also improves the speed of the Ubuntu UI.
I have Variety installed from the PPA's and discovered it was slowing VirtualBox to a crawl at times. Disabling the autostart from both the Variety preferences and Startup Applications restored the speed.
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