I am running 6.01.2 and no lag that I have noticed, never had lag on any prior versions either.
Are you using RDP to view the BI console when you get the lag?
Is there any lag when using UI3 to view the cameras?
Is the lag present in solo view or the multi camera view?
I just looked as far as the change log and there was no entry
So before I try to write a novel on the subject, what are you trying to detect and do you get a lot of false alarms!
I suspect that the built in AI is just a replacement for the external CPAI system, as it was only just released and there is no documentation any thoughts would be nothing more than speculation!