I think it is some coding in BI once AI came into be that is accidentally causing a delay.
When I updated once it went from quick to 8-10 seconds. Make time is 0.5 seconds and no WAIT action in mine.
I rolled back to the previous version and it was quick again. I am still in the Deepstack era LOL.
I confirmed this by installing BI on a test machine with only one camera and no BI AI, and the alert was 8-10 seconds whether I had it under immediate or under the normal alert.
I sent a request in, but haven't been able to confirm whether it was fixed or not since I have decided to stay with DeepStack until ProjectCode settles down.
I suggest sending in a note to BI. If enough people complain, he will look into it.