I finally get why the old Doom mappers hated visplanes so much

Kept reading posts saying you should just draw whole sectors with the node builder doing the work, but after porting a 1994 E1M7 edit into GZDoom and having the frame rate fall off a cliff in that big open courtyard, I learned that overdraw on those flat visplanes is the actual killer, not sector count, so now I cut every floor into smaller steps before mapping and has anyone else had to rework a map because of that?

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