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I have had great success with KVM on a workstation. If you like GUI's, virt-manager takes some of the pain out of learning a new system, at the loss of some capabilities. However, I was able to get very good response on an older Dell Inspiron 23 with 8G of RAM and a 4 core i5. I was able to run Windows 10, Windows 7, FreeBSD and a Devuan workstation on them (one at a time) and get very good response most of the time.
On my Lenovo ThinkStation D30, 32G RAM and 8 core Xeon E5-2637, I run multiple virtuals at the same time, depending on what I need.
In this case, I'm