Activator performance improvement

Shouldn't close the previous PR early. Turns out I did not have to change much of my design.

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@pranavkm
@halter73 
@rynowak
@ipjohnson
@yishaigalatzer 
I'm not suggesting to do it for perf - I agree that would be premature. But from a logic perspective I think it would be clearer to declare this statically to make it clear to the reader that this is immutable and depends on nothing.