I had problems with lagging - midi against audio - using a midi output like microsoft gs wavetable synth or virtual midi synth. I could adjust latency but it run out of sync after a time anyway.

But Dxi synths don't have these problems, they run out of the box without adjusting the latency. Only the built-in soundfontplayer VSTSynthFont64 (from BiaB 2019) is buggy and BiaB was unstable with it. I solved this getting a new version from here: synthfont.com.

I use BiaB in Virtualbox for a week now and don't have problems to report up to now.