Since it's been around for some time now, I'd be interested to hear what
others feel about using the knobChanged hidden knob in a
gizmo, considering how often it gets triggered.

I've found that even a basic conditional for disabling a knob if a checkbox
is on, can slow Nuke down if there are a few instances of this node. This
really makes it seem unacceptable to use.

Should I look at using knobChanged functions defined in the plugin path
instead?

It makes the case for learning to write plugins seem more compelling since
all that kind of stuff all seems to come "for free".

Thanks,
Michael
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