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[Pukako]

Ok - so I'm still in 31.18, and had all sorts of issues with slow FPS and crashing on embark in my last world, which has been great for 6 or so fortresses. So I figured it might be a file problem, and genned a new world.

Things great, except for drowning my starting 7, so reclaimed, and was going well, until mid summer, when FPS, set with a max limit of 100, shoots up to 140, stays there 30 seconds, then back down.  Now it's started crashing down to 20, up to 80, down again, etc, with random pauses, etc

I've got a volcano, but no magma flow, and a small stream, but none of the real FPS killers.

Any ideas? It is really causing issues.

[Flaede]

ghosts?

[wuphonsreach]

I'm betting on a pathing issue.  I have a fortress in it's 2nd year, with a similar issue, where every few seconds the entire screen pauses and FPS drops to nothing.  It didn't start until I was forced to seal off the outside world due to a pair of simultaneous goblin invasions.

[Marshall Burns]

It might also be temperature, as the game has to track and make sure that nobody's gonna start melting/freezing when the temperature changes. I have a similar problem at my fort every winter.

[Proteus]

IŽd also assume ghosts.

It is the usual FPS behavior when ghosts appear.
Just make memorials for everyone who died in your fort to date
and place them.
I assume your FPS issues will disappear

[Marshall Burns]

Doesn't explain why it happens to me, though. I haven't had any deaths at all.

[Pukako]

Have finished that fortress, after same issues + ghosts on reclaim...

I think that there was an underground magma pipe that was happily draining into a cavern somewhere, invisible to me & the dwarves, but making life hard for the cave swallow population and my CPU...

[wuphonsreach]

Ghosts could indeed have been it in my case, during the time where I was getting the wild FPS swings, incoming waves of migrants and traders were getting slaughtered by the goblin ambushes outside.  So I'm sure there were a dozen+ ghosts up top of migrants who never made it into my fortress. 

(Nor could I go out to reclaim their bodies due to the goblin issue... I could build coffins aplenty and place them, I just couldn't go do the burial detail.)

[Vercingetorix]

Doesn't explain why it happens to me, though. I haven't had any deaths at all.

Did you say you reclaimed?  The dwarves who died on the prior embark might not have been properly buried and so spawn ghosts.

[Marshall Burns]

Nope, mine's a brand new fort. It's a mystery.