I just tried the 64 bit Linux version with Ubuntu 14.04 x64 running under the current version of Parallels, and performance seemed fine. I also tried the Windows version running in a Windows 8.1 VM under Parallels, and that performed fine also. (Speaking of that, is there a reason there's no 64-bit Windows version?)
Having said that, if you don't already have a VM set up, then it's an awful lot of work just to run one app. My Windows 8.1 VM is VM-only; I don't have Boot Camp configured on my Mac at all. It is my understanding that if you do have Boot Camp set up, you can configure Parallels to run that Windows without having a separate VM, but only some Windows versions have a license that supports that. (My OEM copy of Windows 8 that I got with the Mac to use in Parallels doesn't have such a license.)
From my past experiences with OpenGL in Linux in VirtualBox, I strongly suspect that the performance there would be lacking. LDView performance sucked rocks in VirtualBox, but isn't bad in Parallels. (Ubuntu desktop performance sucked rocks in VirtualBox, too, the last time I checked.)
Having said that, if you don't already have a VM set up, then it's an awful lot of work just to run one app. My Windows 8.1 VM is VM-only; I don't have Boot Camp configured on my Mac at all. It is my understanding that if you do have Boot Camp set up, you can configure Parallels to run that Windows without having a separate VM, but only some Windows versions have a license that supports that. (My OEM copy of Windows 8 that I got with the Mac to use in Parallels doesn't have such a license.)
From my past experiences with OpenGL in Linux in VirtualBox, I strongly suspect that the performance there would be lacking. LDView performance sucked rocks in VirtualBox, but isn't bad in Parallels. (Ubuntu desktop performance sucked rocks in VirtualBox, too, the last time I checked.)