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I think the solvers _are_ tuned for PP. But we're comparing CSA and PP on the queries that Formulog issues... which don't really match well with the DFS discipline that the PP stack aligns with. I think CSA beats PP in our experiments because CSA is more flexible about locality.

Broadly---and I haven't looked at the memory usage to confirm this---I think CSA trades space (cache more old formulae, not just the prefix of some stack) for time (look, our answers are in the cache!).




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