Working at the lower level functioning of Maya, is a very different experience as there are lots of obvious elements to consider. Basic rule of Maya is that a node is computed only if there is a need of new output from that node. So if there is no output attribute or if it's not connected then the node is not computed. There has to be another node dependent on output of our node for Maya to call compute method of our node. And we have to explicitly mark a plug clean to tell maya that the output is latest.
edit:
Technically not entirely correct post. I will be posting a new elaborated post explaining this matter.
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