Virtualization Load?

I wonder if someone could throw an eye on this and advise me.

My box has

• i3-3110m - 2.4Ghz twin core, your typical sucky 2013 laptop cpu.
• 6GB ram
• 250G SSD
• Intel HD 4000 (Ivy Bridge) GPU
• Intel Series 7 chipset.

When it was still free, I downloaded Windows 10 64bit and installed that in Virtualbox. But I can't give it more than 50% of the assets, i.e. 1 core & 3G of ram, and windows isn't happy with that. Top shows Code: 6611 dec 20 0 6829596 3.5g 3.2g S 125.0 61.9 2:14.35 VirtualBoxVM
6550 dec 20 0 1311880 139548 77884 S 6.2 2.3 0:02.19 VirtualBox
1 root 20 0 2464 1484 1368 S 0.0 0.0 0:00.75 initand windows is nearly frozen (with NO apps open). I wanted to try zoom on W10, but I wouldn't trust the speed. htop shows 2 processes @ >=100% and the free shows 4.5G out of 6G used. In case it was my windows version, I downloaded another, but it's no better.

So what is it lacking? CPU cores? More Ram? Disk space(It has about 50G)?
Mint, btw is slower in a VM but not drastically, and linux distros run @ 1G-1.5G usually on XFCE. I don't use kde or gnome - they strangle it also.