ZeroVM reduces the accepted X86 instructions and also restricts more syscalls than Google NaCl. Per Google's NaCl devs, NaCl's restrictions result in an averag

ZeroVM reduces the accepted X86 instructions and also restricts more syscalls than Google NaCl. Per Google's NaCl devs, NaCl's restrictions result in an average of 10% drop in performance, though it's application specific. ZeroVM should result in slightly greater drop in performance given its restrictions.