Windows has what are called power profiles. Basically it manages the processor, video card, screen brightness, hard drive sleeping, USB ports, anything that can consume power. On desktops I disable it because I don't have to worry about battery life. On laptops, it typically has 3 defaults.
These 3 defaults are Power Saving, Balanced, High Performance. Make sure your using High Performance when playing games. Another possible issue is the fact that your laptop has 2 video cards. The Intel one integrated into the processor and the Nvidia discrete card.
First, make sure you have the latest Nvidia drivers for your card. Second, launch the game on the modpack you want to use. Once it reachs the main menu you can close it. Third, open the Nvidia Control Panel and go to Manage 3D settings and then program settings. Last, click add and it will bring up a list of recently used programs. Select Java and add it. Change the settings for Java to this:
Vertical Sync = Use the 3D application setting
Threaded Optimization = On or Global Setting
Power Management mode = Prefer maximum performance
Multi-display/mixed-GPU acceleration = Single display performance mode
For any other settings, just use the global setting.