I've noticed some strange behavior for "slow" VNCclients. Does the server throttle user input to the client as a function of how fast the client is responding?

I have a client that I want to limit the frame rate for. So I've created my own VNCclient with a delay timer in the main processing loop. The problem is that the VNCServer seems to spread out my mouse events over time even though they have already occurred. I would expect my mouse behavior to be very jumpy, but what I see is the events spread out over time. What is the VNCServer doing?

thanx, mark