I installed Ubuntu under Hyper-V and for reason the UI with all the effects is S-L-O-W.
Quick steps for disabling the UI effects:
sudo apt-get install compizconfig-settings-manager ccsm
Then head to the effects tab and disable those that you want. This does not make the UI blazing fast, but helps a bit. NOTE: You may not want to take away the window decorations, as that means losing the title bar.
(Tip via IT World)