that depends on your setup. ballooning is just a function to move memory from the guest to the host; if you move too much memory you'll get thrashing. the bigge

that depends on your setup. ballooning is just a function to move memory from the guest to the host; if you move too much memory you'll get thrashing. the bigger problem is I/O indirection through the host; for I/O heavy workloads you'll want to use PCI passthrough for best performance, which (assuming it's working properly) should be identical to native performance.