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Fedora 28 as a VirtualBox Guest - major performance issues

I experience serious performance issues when running Fedora 28 Workstation as a VirtualBox Guest OS. I use the latest VirtualBox version (5.2.16) with the official extension pack.

As Fedora 28 Workstation comes with VirtualBox Guest Additions pre-installed, the problem is not related to not having guest additions installed.

Screen refresh is extremely slow, just moving the mouse pointer is slow and lagging. It is impossible to use, plain and simple.

I use the same configuration with Debian 9 and it works as expected, with decent performance: 8192 MB RAM 3 CPUs Max Video memory and 3D Acceleration Enabled

Standard Settings for everything else.