Quickie, here.
I had mined out 4 z layers (using up ramps, so I only had two walkable floors). Decided the extra empty z layer of walkable ground might be hurting my FPS.
Prior to collapsing it: ~140 FPS.
After: ~90 FPS.
Years later, my FPS never returned to its old glory.
Any idea why?
Things that happened:
- One less z layer of pathable ground
- Ton of rocks strewn about, though none destroyed if the stocks screen is to be believed.
- Amusingly, I have down ramps connected to the ceiling now. Stalactites, cool.
- VERY long time at ~.5 FPS waiting for all the dust to disperse, right after collapsing it.
- A ton of rock dust made, covering the floor and all the mined out rocks. Removing it with DFHack did nothing for my FPS.
- A small portion of the ground was sand, not rock. After collapsing, it was covered with grass. (?)
- As a last ditch effort, I deleted the main layer's rocks with DFHack. Again, no boost to FPS.
- Dunno how of note it is, but it's a 2x2 embark (was trying for a super FPS fort).
Unfortunately I didn't enable backups on this fort so I can't do any science relating to continuing the fort with and without that z layer. I just know I lost a third of my FPS for it never to return after collapsing a huge amount of floors, and am wondering why so I can avoid the problem in the future.
Current theory: The contaminants are causing the FPS drop and DFHack only removed their visibility. Another possibility is my floating down ramps stalactites messing up the pathing engine in weird ways somehow, since I've never seen that happen before.