Factorio Forums

I set up a test to measure the cpu performance of basic belts and underground belts in Factorio 0.12.17. In each case I have 64 full belts moving items 1088 tiles.

You can download the save to test for yourself, just connect the top or bottom electric network and wait for the belts to fill up. Basic belts
FPS/UPS = 13.9/41.6
Entity update: 23.923/22.933/25.798

Underground belts
FPS/UPS = 22.9/68.7
Entity update: 14.124/13.789/15.342

Underground belts are the clear winner. If you care about cpu performance, you should replace all belts longer than 5 tiles with underground belts.


I hope the developers can do more optimizations for long-distance belts. I think basic belts look much better than underground belts, and I hate being forced to replace them.

those are some pretty nice number dave

did you test with the other types of belts too?

Doesn't this rely on the cpu you use? So, isn't this a non-issue for haswell + ?

I always somewhat figured that underground Belts would be a bit better performance wise than normal Belts, but it is good to know this for sure now. Thanks Dave!
It's actually a bigger difference than I would have thought. Definitely using !ore undergrounds in the future wherever I can.

This is very good to know, thank you!

Jaridan wrote:Doesn't this rely on the cpu you use? So, isn't this a non-issue for haswell + ?

Having a faster CPU only means you can build a bit more stuff before performance becomes an issue. Underground belts are still more efficient even on a supercomputer


Also, note that I'm almost certain underground belts are more efficient when you use max lenght of them. If you put entry and exit right next to each other without any space, they are at least as slow, if not slower than normal belts. As was said in OP:

you should replace all belts longer than 5 tiles with underground belts

Jaridan wrote:Doesn't this rely on the cpu you use? So, isn't this a non-issue for haswell + ?

I have a i5 4690k still have 20fps on one of my maps. so not really.

fps depends on your gpu. a stronger cpu only means more ups

kinnom wrote:fps depends on your gpu. a stronger cpu only means more ups

Thats not entirely correct - scene still needs to be prepared and that goes on cpu. So good cpu helps always for both fps and ups.

orzelek wrote:

kinnom wrote:fps depends on your gpu. a stronger cpu only means more ups

Thats not entirely correct - scene still needs to be prepared and that goes on cpu. So good cpu helps always for both fps and ups.

and opengl/directX11 adds quite a bit of overhead before things get to the GPU

My test useing this map
system intel I5-2400 3.10 Cores: 4, 32bit, 4GB RAM, Win7, factorio 0.12.17

load map FPS/UPS= 60.3/179.6 Entity update: 0.420/0.206/0.576

underground belts
man zoom out FPS/UPS= 26.5/79.4 Entity update: 11.622/8.891/15.749
min zome in FPS/UPS= 28.4/85.3 Entity update: 11.319/8.990/17.038

basic belts
man zoom out FPS/UPS= 12.8/38.5 Entity update: 23.158/18.916/30.919
min zome in FPS/UPS= 15.1/45.2 Entity update: 21.739/18.762/28.650

Hm.

Some more experiments might be interesting... What is faster:

- Assembly: An empty assembly or a full assembly? A limiting smart inserter on the insert-side or on the output-side?
- An empty belt or full belt? Or a belt with only some items on it?
- inserting onto a full or empty belt?
- train transport vs. belt transport
- logistic bots vs. belt transport
- ...

ssilk wrote:Hm.

Some more experiments might be interesting... What is faster:

- Assembly: An empty assembly or a full assembly? A limiting smart inserter on the insert-side or on the output-side?
- An empty belt or full belt? Or a belt with only some items on it?
- inserting onto a full or empty belt?
- train transport vs. belt transport
- logistic bots vs. belt transport
- ...

Assembling machines (provided they have no fluid in the results/ingredients) will take 0 CPU time when they can't work due to lack of items or too many items.

The same applies for transport belts. If the items aren't moving or if there are no items they take 0 CPU time.

As for the others, that depends on how they're used.

I rebuild some parts of my factory to remove all items on belts, when the part of production is not used (was an really interesting task) and it brought some milliseconds.

I have plan for some hardcore belt optimisation for belts for the future. It would be especially effective for long belts.

Would the different belts/underground belts put more/less stress on the CPU?

Rseding91 wrote:
Assembling machines (provided they have no fluid in the results/ingredients) will take 0 CPU time when they can't work due to lack of items or too many items.

The same applies for transport belts. If the items aren't moving or if there are no items they take 0 CPU time.

As for the others, that depends on how they're used.

not if they have to be rendered

you still need to push the position of the sprite at least to the GPU

If the fun in this game is derived from seeing a hugely complicated factory move around large numbers of goods in complicated processes, how can moving part of that underground possibly be a good idea?

I guess this (i.e. the pure fact that belts are a non-trivial performance drain) is also another argument for trying to eliminate belts wherever possible by feeding intermediate products directly into the next assembler.

DaveMcW wrote:I set up a test to measure the cpu performance of basic belts and underground belts in Factorio 0.12.17. In each case I have 64 full belts moving items 1088 tiles.

This is 69 632 full belts, not something one would naturally build in a game. So unless you are building some huge monstrosity, it should be smooth.
But yes, optimising is always fun just to prove myself that I can push it further

kovarex wrote:So unless you are building some huge monstrosity...

But... but... isn't that the whole point of this game??

If your FPS isn't impacted, you're not done yet!