Slow speeds when ripping via VirtualBox & DVD Decrypter

[AShillingNoMore]

I use a Windows XP virtual machine for all my ripping and despite me changing external DVD drives my speed remains abominably slow when using DVD Decrypter. I've tried some of the speed tips pinned at the top of this forum and am wondering if VirtualBox deliberately attempts to limit read speeds on optical drives pass-throughed to the virtual machine, is this the case?

I've also tried MakeMKV, which works at an OK speed, but only works with roughly 10% of the disks I have. It's the same with WinX DVD, DVDX 4.0 and DVDFab.