How does it compare with nanovms ?

For a while nanovms was based on Rump[0], which had terrible performance. The new version of nanovms[1] we haven't benchmarked but we should; having said that, even the founder says they "[...] have spent very little time benchmarking" [2]

[0] https://en.wikipedia.org/wiki/Rump_kernel

[1] https://github.com/nanovms/nanos

[2] https://www.gula.tech/blog/files/135c832f92668268f1e9140a524...