I think there is a user need that this timeliness requirement satisfies, and I think we need to make it a lot clearer what that is. Out of discussions with Charles at Microsoft.
Access is then slow.
It does not suffer any system scheduling problems when run in this manner. The AT user should have the same experience. Without invertigating the methods used, I'm not sure you can make any conclusions based on this. It also could just be poorly written code. The other issue is synchronization.