New processors are created within the community all the time and the documentation for processors should include resource considerations for CPU usage and Memory usage. Just because a processor list memory as a resource consideration, that impact is often a byproduct of how that processor has been configured.
you can refer to the imbedded documentation in your installed NiFi instance or you can right click on a processor added to the canvas and select "view usage" from the displayed context menu to go directly to that components embedded documentation page.
But processors like ReplaceText, SplitText, SplitContent, SplitJson,... would be examples.
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