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[nimbus25]

How much of a difference in FPS does 64 make? I decided to try it, not having played since 42.06, and the lack of 3rd party programs is a bit annoying. DFHack is prone to crashes and no Dwarf Therapist at all is a bit annoying to manage, so I wanted to know how much FPS does 64-bit actually save you?

[Shonai_Dweller]

In theory it should save you nothing as that's not what the 64 bit release was about.
Having said that various people have reported various levels of improvement in both fortress and adventurer, but it's very difficult to compare as there's no easy way to generate identical world's in both versions and there's a lot of elements that contribute towards fps death that make it different every time.

So, don't expect any change at all. But 64 bit won't crash when you hit a 32 bit memory limit so there's no real downside to using it.

[Fleeting Frames]

There is a downside - there is DT memory layout for 32-bit windows, but not 64-bit.

Though, Max™ did anecdotally report 64bit being faster in worldgen: Major performance improvement with 64 bit?

[King Kitteh]

All you get with 64-bit is more RAM AFAIK.

Less crashes due to running out of memory, so you can generate worlds for longer and such.

[Quietust]

All you get with 64-bit is more RAM AFAIK.

x64 also provides more general-purpose registers, potentially allowing the compiler to generate more efficient code (e.g. by avoiding repeated memory accesses). Then again, it also increases memory usage because pointers are twice as large, but that increase is fairly minor in the grand scheme of things.

[Glitchy]

Well, someone has fixed dwarf therapist for 32-bit version using their own code.(and I can confirm their fix does work for 43.05).

So I'd stick to 32-bit.

[azrael4h]

I can't say for certain, since my experience with 64bit DF has been on a newly built computer that I never ran 32bit on, but for Rewardpages, I have a population of 154 dwarves, and have been hovering at 45-51 FPS for a year, even during sieges. This will likely go up as there are a couple hundred corpses on the map, along with assorted junk. The caverns are also burning eternally, as there's a flame-bodied FB wandering around setting crundles on fire. I'm currently cleaning up the corpse problem, and have a chute to the magma sea for trash, so part of the issue will be taken care of shortly.

I run 1, mostly open, cavern layer for FPS reasons. My fortress is also relatively compact, though again I have a LOT of trash.

My old computer would have been running around 20-30fps at a similar stage of development, with significant drops during sieges.

[Dozus]

Relatedly, can 64 bit saves run on the 32 bit program?

[Quietust]

Relatedly, can 64 bit saves run on the 32 bit program?

Yes.

[Libash_Thunderhead]

Well on my computer, they are the same.
Or at least, don't expect magical fps improvement, for now.