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[Urist Da Vinci]

I think that the main reason they cause so much lag is because they path through walls of any thickness, and possibly up and down z-levels through rock, so it is like you have a bunch of flying creatures with 100+ z-levels of open space to create pathing options for.

I posted it today on mantis .

Probably it is only sometimes because ghosts are not pathfinding constantly.

AFAIK ghosts would create less work for the pathfinding function as they could fly in a straight line to their destinations. They don't have to explore tunnels like a dwarf would. The pathfinding function doesn't always try to plot several alternate routes to a simple destination.

I wonder if a ghost who originally died due to magma/atomsmashing would generate lag because it tries to path to its body, but fails since its body doesn't exist anymore, and then tries again. We could test that by comparing ghosts created from atomsmashing a migrant wave to ghosts from drowning a migrant wave.

[dwarfhoplite]

Can somebody give me link to the thread which is about increasing fps with gameplay choices?  i cant fins it. thanks.

[Sutremaine]

I wonder if a ghost who originally died due to magma/atomsmashing would generate lag because it tries to path to its body, but fails since its body doesn't exist anymore, and then tries again. We could test that by comparing ghosts created from atomsmashing a migrant wave to ghosts from drowning a migrant wave.

I've had a lagging ghost who died to wildlife.

[Chocolatemilkgod]

I've seen a general decrease in lag since when I started DF. Especially when I started to mess with some of the settings and to wall off unused areas, and setting the DF setting to Realtime on your computer helps a WHOLE bunch.

[Schmlok]

Don't know any threads, off the top of my head.

These work for some, not for others, good luck.
1. Embark size smaller.
2. Change your cavern openness and paths to something like 65/100, 0/2, or don't breach at all.
3. Fill a trench outside your booze room 3/7 deep(pond/buckets), maybe use dfcleanmap in addition.
4. Cage animals.
5. Use the pathing restrictions(high, low, restricted)
6. Keep your hallways at least 2 if there will be any traffic.  Some suggested a 3 wide with a high traffic value in the center.
7. Reduce/stop Flowing water

It also helps to figure out if it is your graphics card, or your processor that causing the problem, because there are several graphics modes to chose from.

[Chocolatemilkgod]

You can refer to this as well:

http://df.magmawiki.com/index.php/DF2010:Maximizing_framerate

And sorry for the double post :/

[Zoomulator]

Definite yes on ghosts causing lag (using 31.18). I had 100 dwarves running around and two ghosts causing mayor lag spikes that could last up to two seconds on occasion. I finally buried the two restless souls and everything runs perfectly smooth at 90fps!
It stayed that way until some giant decided to raid my fortress an kill all but one of my 100 dwarves and 20-30 animals. Last dwarf went insane, ofcourse, and decided to run away which is the sanest thing anyone ever did... My beautiful marble fortress covered in blood. Such a shame.

[MiniMacker]

I actually got an improvement in FPS in recent updates.

[ZetaX]

31.18 behaves strange for me: It sometimes runs at 30FPS, sometimes even over 100FPS (45 year old large fortress, 60 dwarfs), but ne reason visible for this changes (ghosts are not to be seen in the unit list, and slabs for everything [even gobbos] were built in anticipation).
But on average, it seems to do better than 31.12.

[D3matt]

I had 2 ghosts wandering around and had little issue. Then again, the system specs probably explain it...

Windows Vista 32
NVidia GTS 250
AMD Phenom II 965
4GB GSkill DDR3-1600

Probably a bit higher than the average DF PC...