Ironically enough, I worked with customer who was doing regular AD query (not identity collector) and they asked me about it, but when we spoke to TAC, they said changes would be instant on CP side. Well, not exactly : - ). We still, to this day, notice that most changes do take effect quick, but I would day about 20% of the time, takes a bit of time.
On the other hand, I also work with client who uses 2 IA collectors and they never had this problem, nor did they ever have to implement sk phoneboy mentioned. Maybe its isolated case, I have no clue in the world. All I can say is, I hope the commands help your case.
Best,
Andy
"Have a great day and if its not, change it"