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better than Virtualbox

Just take a look at VBoxManage --help for a crazy list of settings and features that VBox has accumulated during the past ~10 years.

It even supports ATA TRIM so your fs-driver can discard blocks and keep the VDI-file deflated at all times.

Performance-wise: Compiling stuff within VBox on an i7 quad-core (-j5) is almost as fast as native. X on Linux-VMs feels native too, especially when running in fullscreen.

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Out of curiosity, have you tried anything other than VirtualBox (e.g. VMware Fusion)?

I was happy with VirtualBox's (on OS X) performance until I bought VMware Fusion. I didn't do any benchmarks so I don't have numbers to back up my claim but it definitely "felt" much faster than VirtualBox.

I never tried VMF so it may be faster, sure. The thing about VBox is, like I wrote, features. VBox is basically a full-featured Virtualization-Suite, has multiple UIs and an API. It is also available on Win7,8,10/macOS/Linux and Solaris.

You may add: excellent documentation and friendly support (board, irc, list).

If I'll ever have to switch, I'd first need feature-parity.

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