The Consistent option is to tell the detect node to hold on to the last detected object as long as it stays detected, even if another object is a better choice.
The garbage collection you are seeing is due to a problem in our SensorManager. Well not so much problem, more that it wasn’t as optimized as it could be.
This is all fixed in the next release of RAIN. We went through and cleaned up all of our sensors to reduce garbage collection and make the code side a bit clearer.