WinOLS 4.7 is lightweight by design. It can run on a Core 2 Duo with 2GB of RAM. But when you place a VM on top of Windows 10, you are consuming 4GB of RAM just for the hypervisor. A native "No VM" setup leaves 100% of your resources for map editing and file comparison.
WinOLS 4.7 “No VM” Explained – What You Need to Know Before Downloading Winols 4.7 No Vm
When you run WinOLS 4.7 inside a VM, you introduce layers of abstraction: WinOLS 4