RH-based distros slow in Virtualbox

piokos

Senior member
Nov 2, 2018
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I use Linux guests a lot in daily tasks (Virtualbox, W10 host) and lately wanted to move from current Arch/Debian mix to RH-based config (Fedora or openSUSE - for developing and CentOS - for servers).

Sadly... both Fedora and openSUSE seem VERY slow and unresponsive compared to Ubuntu and Mint with similar software running.
I checked Xfce and Mate (which I normally use), but also Gnome and KDE (which are heavier, but default for the distros).

Each VM has 4+ GB RAM and 3 threads, but performance is bad even in idle.

Any idea? Is there some crucial Virtualbox setting that I'm missing?
VT-x, Nested Paging and 3D acceleration are already on. I installed VB guest additions.

I used RH and Fedora a lot back in the day, but never as guests. These last few days were really disappointing...