Jmeter -- how memory-consuming is__UUID()?

I've faced a situation when some of my tests require posting some absolutely unique data. Therefore I need to use __UUID() function.

I was wondering if the usage of this function can create additional load, as apart from doing what the test is supposed to do it generates the guid.

How memory-consuming is this operation, and how 'clean & objective' such a test can be considered in terms of performance analysis?