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[locustgate]

History length x world size equates to a great deal of FPS drop. The longer the history and the bigger the world the slower it will run.

The world's populations and settlements develop very rapidly in this version so a world with a couple hundred years history is very mature and well settled at that point. Small or medium worlds with a only a couple hundred years history should run pretty well where  as a large world with a thousand years history will not.

My world is 5 years old, and still 30fps. My mantis ticket said it's this version, none of it is even slightly optimized. So run 4.01 without autosave.

[peskyninja]

FPS drops here are quite random. The game runs at 100 fps but suddenly goes to 60 or 30. It's not related to invisible baby wagons though. I've tried embarking in places without trees and I usually got VERY low FPS upon the arrival of flying critters. These seem to becoming stuck in midair for indefinitely long times or jamming themselves in invisible walls, floors or cliffs.. That may also be related. All that happened in .01 in small->tiny worlds with various history lengths. Now I'm I'm getting the same random drops with flying critters or full randomness too. Further tests must be made to see if trees have something to do. Probably they have as they open new pathfinder options.
Edit : Forgot to add that assigning the game to only one CPU improves performance. Or at least seems to.

[Orkel]

I'm also getting flyers stuck in one midair blob never moving (in my case, Giant Thrips). Perhaps this lag is somehow related to their pathfinding going into some kind of infini-loop?

[FutureSailor]

Flying critters got stuck in the last version too, for me at least, I don't think that's causing it. I actually like the bug, I turned off invaders, beasts, etc. because I want to build a massive plantation without worrying about defenses, and now I know for sure that a bunch hostile animals won't spawn.

Anyway, I assume everyone else's water is spazzing out? When I inspect things, the foam tiles keep moving around even though everything else is paused. I have perfectly normal fps on maps with nothing but ponds, a bad fps when there's just a brook, and abysmal fps when I have two rivers and a brook flowing into a big lake.

I wonder if optimizing the calendar means making it its own thread. Just make the world-stuff-thread immediately write its results, without the currently loaded game seeing it, then reconcile it when the player saves but before anything is written, and you don't even have to worry about mutexes and semaphores.

[reality.auditor]

I wonder if optimizing the calendar means making it its own thread.

No. It means it will execute faster.

then reconcile it when the player saves

This makes no sense. Why events in the world have to wait until player saves? What about simplest relationship of new events in world with your fortress: news from world that comes with liason?

[Robsoie]

some pathfinding problem can cripple performance highly.
On a recent fort, i dug to the cavern, there was a lake with a big fungus on top of it, but it was out of distance (unless jumping) to reach if i didn't build a bridge/floor.

And i didn't.

After a while i got suddenly an enormous slowdown, a turn seemed to take at least 5 or 6 seconds.
I was wondering what was going on and noticed a message about a dwarf constantly cancelling drinking despite i had a nice well that every other dwarves were visiting regularly.

I looked for that dwarf and saw him on a land in the cavern that wasn't just accessible , my only guess is that somehow the dwarf jumped from the stair to the mushroom for reason i have no idea (as with floor/bridge it was the only way to reach it) and climbed down to that land (that was accessible from the fungus)

And from then it was unable to find any pathfinding back, and that destroyed the game performance so much that even after ordering building a couple of floor to make a small bridge between stair and fungus, the game just gave up and crashed.

So i recommend to make burrows to force dwarves avoiding to go on a stupid stunt like that and breaking their pathfinding code so much the game become unplayable.

[BigD145]

ok, what the fuck. I have only 7 dwarves, a small world with only a 50 year history, and no running water, and I'm getting 30 fps.

History now continues after world generation. You're welcome.

[Gukag]

So far I'm having the opposite experience. 4.01 fort was victim to random massive FPS drops for no reason, current one is smooth as GCS silk. Similar maps with volcanoes, more or mess same ammount of trees and biome. /shrug

[TomiTapio]

I just reduced the civilization population counts in OldGenesis and tried a 2x2 embark. Got 170-235 FPS (3-core AMD Athlon II X3 445, 3.1 GHz, 2011) after initial mining ops.

Y'all can try my save, it is Ironhand graphics, region1: https://dl.dropboxusercontent.com/u/8967397/DF40_03_oldgen_ironhand_preview5_with_goodFPS_save.zip  it is .05 but foldername meh

Spoiler (click to show/hide)

pre pop reduction:
   29 Orcs
   10525 Nords
   498 Keepers
   24773 Sylvan elves
   13526 Dusk elves
   26863 Dunedwellers
   6883 Goblins
   16784 Scavengers
   24 Beastmen
   5759 Centaurs
   5980 Demons
   8090 Kobolds
   8080 Dwarves
   21042 Illithids
   8912 Snakemen

   Total: 157768

Post reduction and only 31 years of history:
   79 Orcs
   775 Nords
   215 Keepers
   618 Sylvan elves
   400 Dusk elves
   350 Dunedwellers
   275 Goblins
   45 Scavengers
   143 Beastmen
   143 Centaurs
   770 Demons
   1686 Kobolds
   407 Dwarves
   408 Illithids
   674 Snakemen

   Total: 6988

[Romegypt]

whhhyyyy did you resurrect this? It is old and no longer relevant, and I am now getting 125+ fps again, on a really bad computer.