I tried running it in a VM earlier last year and found the UI to be unusably laggy. It seems there were some issues with virtual mouse drivers or something and this was the "expected" experience in a VM.
No, that's definitely not the expected experience for VM usage. Plenty of people run Haiku in a VM without such problems. QEMU/KVM is the best system to use, with VMware second, and VirtualBox et al. coming in last.
