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[bool1989]

So I'm considering embarking on a major project that will eventually involve a magma moat.

The world size will be 64X64 to help reduce fps issues, but i'm planning to embark in a cold area, maybe a glacier or tundra or something, and on top of a volcano.

I plan for this fortress to last for centuries, as I want to get Cave Dragons.

I also plan to set up an obsidian generator and farm obsidian blocks for the project, as well as glass, if I can manage to make sand, or find sand on the embark site.

I'm already planning to take steps to reduce FPS problems, but once I start the  project itself the fortress will be centuries old by then and thus likely to already be aflicked with FPS loss.

I guess my question is: will a significantly large magma moat cause problems for the FPS?

Edit: I meant when they're stable and not flowing.

[martinuzz]

I believe that when it's all filled and stable it shouldn't be too much of an FPS drain (if any at all). The filling itself can also be FPS reasonable by clever pumpstack design (to avoid constant temperature re-calculation while it is pumping)
Not sure about rain however, you might want to roof it over.
Trees growing too close could be a thing to avoid too.

My intel might be outdated though. Been ages since I had a magma moat, could well have been the 0.3x series.

[Mohreb el Yasim]

i did a magma moat, 2 tiles wide slowly filled up (like 2 years to go around a 3*3 embark) and it was almost FPS neutral ...
but i drained it directly from a magma tube so it did not involve many moving parts.

[bool1989]

i did a magma moat, 2 tiles wide slowly filled up (like 2 years to go around a 3*3 embark) and it was almost FPS neutral ...
but i drained it directly from a magma tube so it did not involve many moving parts.

Well that's good to know. It's mainly the scale of the project I have in mind that's causing me to work. I don't want to start working on the project if the game is just gonna crash every time I try to fill the moat.

I'll have to wait and see I suppose.

[Mohreb el Yasim]

just don't aim to use magma on the other side of the moat (i did made an obsidian farm oposed to the volcano, and it filled slooowly) but FPS is good in this version, even was able to flood a treefarm without too much hurt on FPS.

[anewaname]

Consider this... every fort already has great quantities of stationary underground magma, and glacial volcano embarks have about 300 magma tiles exposed to cold and snow. The stationary magma is not the problem.

[EmperorCoolidge]

Yeah fluids that aren't flowing take up very little resources.