GPU is running around 70+°C , Intel Graphics around 85-90°C.

That's the save
https://www.dropbox.com/s/cyoupdwyaqkhyq1/fim.zip?dl=0

You mean the CPU has not the power to calculate game mechanics fast enough for 60 FPS ?
i5-4200H 2.80 GHz + 8GB DDR3

The base is slightly short of 2 rockets a minute

Here are the two displays

main process is
> Update / Game update / Entity update : something like 30 / 0 / 0

Ok, I've kept digging for solutions, with not much success.

Proprietary (ASUS) drivers won't install, too old (2014) versus NVidia drivers (march 2016)

I tried force open gl, no change
Windows or fullscreen, no change
vertical sync (factorio graphic options) no change

I tried forcing the use of ...

I've been doing green circuits the classic way (3 copper coil assemblers to 2 green circuits assembler) until a few days ago, when I needed the full output of 9,9 green circuit level 3 assemblers.
10 assemblers weren't producing enough and I started to investigate.

Problem : The classic setup ...

The thing is, the drivers from the laptop manufacturer are 2/3 years old ( http://www.asus.com/us/supportonly/R510 ... _download/ ) while nVidia drivers are updated every week. I'm gonna try updating the Intel Graphics with the manufacturer drivers

You might be right. I need a few days to test some variants, because I still believe that roboports centred units are the best way to build, but I am going to test them with plates

Pretty much the same results with integrated graphics, maybe higher CPU usage. 30-35 fps

I used to do that :)
I know that conventional set up have a central smelting or outpost smelting.
I had some quite big ( > 5000 ) furnaces smelting area before.
However, once you start to scale (aka plop big blueprints - more than 200 x 100 ) you have to adapt your smelting area for each new ...

On my biggest file save, I have 8100 furnaces & 3200 assemblers, 2GW setup. Runs at 25 FPS (was faster before).
"New" games tends to be set up very quick with blue prints designed on previous games , so they end up "big" quite fast :)

How am I supposed to know (and switch) which GPU is Factorio ...

For the last few weeks, I've been working on integrated productions units centered around roboports.

I was getting unsatisfied of overlapping / undercovered areas since I had to place roboports between production units.
I read about building around roboports instead of plopping roboports between ...

here it is http://www.malaiac.net/factorio.20160327.debug.zip
Win7 64, i5 4200H 2.8GHz, 8go DDR, SSD

Another level (underground + ground + new over ground) of logistics would be awesome

When the Factorio dev team will start working on adding mirroring to blueprints (like https://forums.factorio.com/viewtopic.php?f=92&t=15152 BluePrint flipper does already), chemical factories and refineries need to have switchable inputs. Otherwise, a simple vertical flip will mess up all inputs :)

On a new game, my FPS is down to 40-50 instead of a normal 60 (with a few lags).
It's a new game with already a few thousands furnaces and assemblers working, 5 MB savegame. Usually works fine.

Am I the only one ?

I'd like that too !

One time order : needed
one time order based on blue prints : great
one time order directed to external container : could work by using the "based on blue prints" on a requester chest.