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[Toriad]

Does anyone know what the main cause of low fps is? Is if the pathfinding? The weather? The temperature? Combination of causes?

[thijser]

A bit of a combination. However pathfinding repeaters that open/close large areas and large water movements are usually the biggest problems.

[Toriad]

Does the game use the A* path finding algorithm? or is it something custom?

[Proteus]

Often itīs caused by a catsplosion in your fortress

Another thing I have encountered is,
that the more underground layers you define during world creation,
the slower the game becomes

[Passive Fist]

Often itīs caused by a catsplosion in your fortress

Another thing I have encountered is,
that the more underground layers you define during world creation,
the slower the game becomes

How do you change the number of layers? I assume it can be less than 3, but can it be more?

[Lytha]

I poured a volcano onto a frozen arctic ocean recently. Magma being pumped out of the volcano's top, 50 z-levels or so above the ocean's surface level. Magma pouring all over the place. Magma melting ice, making obsidian, and water randomly being frozen again. The FPS drop was just amazing.

(And I didn't manage to melt some water properly anyway. That had been the purpose of this experiment.

Too bad, actually. I finally got a 2x2 embark screen with a volcano, an ocean and another biome, and then it turns out that the top level of the ocean (that was the aquifer) was all frozen, and the caverns were void of any water.  )

[3]

Does the game use the A* path finding algorithm?

For the record, near enough, yes.

[Proteus]

Often itīs caused by a catsplosion in your fortress

Another thing I have encountered is,
that the more underground layers you define during world creation,
the slower the game becomes

How do you change the number of layers? I assume it can be less than 3, but can it be more?

Maybe I should have worded it differently...
what I meant was the number of levels between the layers...
you can find it in the advanced settings for world creation

[Urist McPenguin]

Often itīs caused by a catsplosion in your fortress

Another thing I have encountered is,
that the more underground layers you define during world creation,
the slower the game becomes

How do you change the number of layers? I assume it can be less than 3, but can it be more?

Maybe I should have worded it differently...
what I meant was the number of levels between the layers...
you can find it in the advanced settings for world creation

Yes, under advanced params you'll find "Z Levels Between...", the first (aboveground) is pretty straightforward, the rest are the minimum number of layers between underground features (Caverns, mainly).

Check the wiki for more detailed information.