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question: Is it a reasonable assumption that as a stack gets larger that changes made to the stack start slowing down?

We recently (1.10) made some improvements such that that should no longer be the case. Performance should be dominated by the number of changes that are made, not by the total number of resources.  Are you using &gt;= 1.10.0?

nope, I was debating how to structure our code base, whether or not to use multi-stacks vs one mono-stack

the assumption a multi-stack might be better is because of performance, but seems like that won't be an issue