openBVE isn't really a demanding game, and also not all games support nVidia Optimus (the process which switches GPUs) or whatever AMD calls their switching process.
@peacemaker: In addition, this train is guaranteed to take up a ton of FPS. You might be able to run a route smoothly with Intel HD Graphics, but to run a train like this with integrated GPUs, I don't really think that Intel GPUs will handle it.
Optimus is a real bitch sometimes, so it doesn't always turn on even if a demanding game is on. The nVidia card on my laptop doesn't turn on when I start GTA IV....
Just to note: Before you do any of this, take the D line, v2.0, and then use the R175 and go to exterior view. This probably will slow openBVE to a crawl because the integrated graphics are too slow for a demanding route and a demanding train. Record the FPS down and close openBVE. Then, do the steps below, go back to openBVE, use the D line and R175. In exterior views, the FPS should improve dramatically, signalling that the nVidia card activated.
If any of you have an laptop with a nVidia GPU, hopefully this will also help you improve FPS in game.
Steps to bypass Optimus in openBVE:
Download latest drivers:
http://www.nvidia.com/Download/index.aspx?lang=en-usWhen done, right click the desktop and click on nVidia Control Panel.
On the Side, click on Manage 3D Settings.
Click on Program Settings
Click Add and then select your openBVE exe
Where it says "Select preferred card", select
"High-performance NVIDIA processor"
Click Apply.