Stuttering using dedicated graphics card

[AzeTheGreat]

Factorio is unplayable if it runs using my dedicated graphics card (gtx 960m). The game is choppy, screen tearing is frequent, and everything runs slowly, including the main menu. If I force it to run using the integrated graphics card then it runs completely smoothly with no game issues. However, the integrated card fairly frequently crashes and has to be recovered (I'm guessing it's not meant to be handling this kind of load). Changing Graphics Quality or Video Memory Usage has absolutely no affect on performance in either case.

Computer Specs (Scroll down to details):
http://store.asus.com/us/item/201511AM230002951/A17602

What is causing this issue, and is there any way to get it to run on my dedicated graphics card?

[Smarty]

viewtopic.php?f=7&t=9300

Can you provide the log with the Dedicated GPU on?

[AzeTheGreat]

Log File

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   0.001 2016-04-23 15:03:28; Factorio 0.12.29 (Build 17931, win64, steam)
   0.001 Operating system: Windows 10 
   0.001 Program arguments: "D:\Gaming\Steam\steamapps\common\Factorio\bin\x64\Factorio.exe" 
   0.001 Read data path: D:/Gaming/Steam/steamapps/common/Factorio/data
   0.001 Write data path: C:/Users/Nathan/AppData/Roaming/Factorio
   0.001 Binaries path: D:/Gaming/Steam/steamapps/common/Factorio/bin
   0.016 Graphics options: [FullScreen: true] [VSync: true] [UIScale: 100%] [MultiSampling: OFF] [Graphics quality: normal] [Video memory usage: high] [Light scale: 20%] [Screen: 255]
   0.017 Available display adapters: 1
   0.017  [0]: \\.\DISPLAY1 - Intel(R) HD Graphics 4600 {0x05, [0,0], 1920x1080, 32bit, 60Hz}
   0.017 Create display on adapter 0. Size 1280x720 at position [310, 162].
   0.470 Initialised Direct3D:[0] NVIDIA GeForce GTX 960M          ; driver: nvd3dumx.dll 10.18.13.6472
   0.506 Desktop composition is active.
   0.588 Loading mod core 0.0.0 (data.lua)
   0.593 Loading mod base 0.12.29 (data.lua)
   1.593 Initial atlas bitmap size is 16384
   1.594 Created atlas bitmap 16384x5509
  21.853 Sprites loaded
  22.230 Loading sounds...
  24.860 Factorio initialised
  52.964 Loading map C:/Users\Nathan\AppData\Roaming\Factorio\saves\Water Start.zip
  53.015 Info Scenario.cpp:124: Map version 0.12.29-0

Also I have screenshots of f6 for both cards here:
http://imgur.com/a/EdrML

Edit: Ok forcing open-gl, which I stupidly missed before, made it smooth. However load times are now absurdly long, and changing the max texture size didn't seem to help.

[Smarty]

Add this to the steam launch options
steam library -> right click factorio -> properties -> set launch options

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--force-opengl

[AzeTheGreat]

Yeah that fixed the stuttering (sorry for missing that before), but now load times are way longer. Specifically between 45% and 51% it seems each % increase takes approximately 20-30 seconds.

[Koub]

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   0.017 Available display adapters: 1
   0.017  [0]: \\.\DISPLAY1 - Intel(R) HD Graphics 4600 {0x05, [0,0], 1920x1080, 32bit, 60Hz}
   0.017 Create display on adapter 0. Size 1280x720 at position [310, 162].
   0.470 Initialised Direct3D:[0] NVIDIA GeForce GTX 960M          ; driver: nvd3dumx.dll 10.18.13.6472

This is the part I don't understand.
How can you have only one display adapter, that seems to be a Intel HD Graphics 4600, create Factorio's display adapter on it, but then have "Initialised Direct3D:[0] NVIDIA GeForce GTX 960M"

It really doesn't make sense to me.

[Rseding91]

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   0.017 Available display adapters: 1
   0.017  [0]: \\.\DISPLAY1 - Intel(R) HD Graphics 4600 {0x05, [0,0], 1920x1080, 32bit, 60Hz}
   0.017 Create display on adapter 0. Size 1280x720 at position [310, 162].
   0.470 Initialised Direct3D:[0] NVIDIA GeForce GTX 960M          ; driver: nvd3dumx.dll 10.18.13.6472

This is the part I don't understand.
How can you have only one display adapter, that seems to be a Intel HD Graphics 4600, create Factorio's display adapter on it, but then have "Initialised Direct3D:[0] NVIDIA GeForce GTX 960M"

It really doesn't make sense to me.

That is the great mystery of dual GPU setups - they always have these "weird issues" - I've never actually seen a setup that used both effectively and switched without issues (It's nothing specific to Factorio).

[Neemys]

On dual GPU (optimus), it's better to launch game on exclusive fullscreen to get only the nvidia working. Factorio doesn't support that well for now (crash on ALT+TAB). If you want to give it a try there are multiple software that can force exclusive fullscreen. I use GeDoSaTo for this. Not at home now so I can't give you the setting I use.