well this is how much the VB has automatically suggested as a safe (green) option.
And to be honest now, it turned out that it is working surprisingly well and fast.
Also, I found out that choosing the Fixed size for the hard disk made a massive improvement for the performance in both host and virtual machine. With the Dynamic size, I had freezes quite often and I noticed some weird memory swappines (although it might have nothing do, I'm not sure) but since I reinstall the virtual machine and chose fixed size over dynamic size it is all good now.
And to be honest now, it turned out that it is working surprisingly well and fast.
Also, I found out that choosing the Fixed size for the hard disk made a massive improvement for the performance in both host and virtual machine. With the Dynamic size, I had freezes quite often and I noticed some weird memory swappines (although it might have nothing do, I'm not sure) but since I reinstall the virtual machine and chose fixed size over dynamic size it is all good now.