How big is the impact of LocalVars in a server/host pc?

As the title says, how big is this impact on the server/host pc performance or disk space? I remember some warnings about local vars and the server long ago when i was learning to mod NWN2. I have been using local vars a lot when i need them since i find them useful, though most of them are temporary and get deleted. I was wondering about that warning.

insignificant. eg Tony’s AI dumps thousands of them onto the module-object (spellinfo for use by the npc ai)

But it’s still a good idea to delete them properly if/when they’re no longer needed

i don’t imagine them being a problem in multiplayer (server-client connections) either

 
I mean, yeah they’re not free, but unless you’re dealing with tens of thousands …

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