Hey now -- I'm not quite that easily impressed! ;) This is a problem domain that I have suffered in[1] -- and we have recently moved from KVM to bhyve[2] for several of the same reasons that motivated Firecracker. Not that it hurt that it was in Rust, of course... ;)
[1] https://www.youtube.com/watch?v=cwAfJywzk8o
[2] http://bhyvecon.org/bhyvecon2018-Gwydir.pdf