virtualbox.org

Hi All, iMac 27" retina graphic performance is just too slow with ubuntu desktop 14.04 LTS. dragging the window in gnome is too lagging. Any workaround?
thanks

Not having a Retina 27" I'm guessing but, make sure the guest additions are installed correctly and 3D acceleration is enabled. If that is not fast enough, reduce the resolution of your iMac.

Edit: See: https://support.apple.com/en-us/HT202471

I already enabled 3d acceleration, but still worst performance

Attach the compressed vbox.log for the guest to a message here.