If you run FTB on a laptop with two graphics adapters,
this normaly means that you're probably running FTB with your CPU integrated graphics, not the dedicated (Nvidia) one.
Right clicking the FTB launcher and selecting the Nvidia GPU doesn't work.
You need to manually add the "javaw.exe" file from your Java installation to the 3D settings tab in the nvidia control panel.
You can find this file most of the time in "C: \Program Files\Java\JRE\bin" or "C:\Program Files\Java\jre7\bin", depending java version.
The way you do this step by step is:
1- Right click your desktop area and select "Nvidia control panel"
2- Select 3D settings
3- Select program setings tab.
4- Click the Add button and search and select the file mentioned.
5- Select Nvidia processor
6- Hit the Aply button and close Nvidia control panel.
All you have to do after this is run your FTB as you normaly do and enjoy your increased FPS.
I hope this helps.