How can I create RT time-triggered events?

We have a RT VI running on a PXI. One of the RT event loops handles turning on and off digital outputs at precise times. Because we want high precision, the loop is running at a high rate (1 KHz) and every iteration, we check to see if it's time to do something. But this seems inefficient to me because the vast majority of the time, we're sitting and spinning. Is there a way to turn this from a polled system to an even-driven system? I'd like to schedule events to occur at given times and use an event handler to process them. But how do I schedule a time-triggered user event?
Thanks,
Keith.

There are other RT timed loops running, but I'm not sure if it counts as "a lot of stuff." As for what controller, I'm not sure (I inherited the system) but MAX says it's a PXI-8187 with a SCXI-1102 and a PXI-1052 (SCXI) SCI with a few cards in it. Is that what you're asking?
How do I find out how much CPU is being used?
The time trigger is like this: The operator hits a "go" button on the host VI. This signals a sequence of on/off timed events that are relative to the time when the button was pressed. The relative timing sequence is fixed before the VI is run and does not change afterwards. It's also a one-shot -- each digital output is turned on once and off once, just at different times.
If the way we're doing it is fine, I'm cool with that. I'm just trying to see if I can simplify things. The previous developer had mentioned doing a lot to optimize, so looking for inefficiencies is fresh in my mind, but I don't know (yet) for sure if there are current problems.
Thanks,
Keith.

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