Why is the game slightly choppy/laggy?

[PheonixKing3000 1]

I have just started a new playthrough for KOTOR 2 and as I progressed a little bit I've noticed that the game has been slightly choppy/laggy.  It's especially noticeable when I pass by smoke and mine fields, it's weird because this did not happen on my old pc.  The game ran very smoothly for the most part on the older pc, also there seems to be a problem with my advanced graphics settings.  When I went there I noticed that I couldn't select frame buffer effect and the soft shadows for graphics, it's just shaded out.  I don't know why, but I feel like it's the main reason why I have been experiencing a fairly choppy/laggy game.  The main menu is where it's the most choppy/laggy, and it's VERY bad too but when I load the actual game it's nowhere near as choppy but still fairly noticeable.  How do I fix this so that I can experience a smooth playthrough like previously?  And finally, whenever I try to alt=tab out of the game it screws up everything.  When I leave the majority of the computer screen is covered in black except like 15% of the right side of my screen.  The lower toolbar is still visible but whenever I click back into the game all the words are gone.  I can move the mouse around and even hear it make that sounds it makes when you put the mouse on for example "New game" or "Load game",  unfortunately the words are gone and it stays like that even when I load a game or start a new one.  I have to turn off the game in order for it to return the words, which means I can't alt+tab out of the game without having to turn it off each time.  I am currently using a windows 8 laptop if that helps.

[vv221 0]

I won’t be able to help you, as I don’t know anything about Windows 8, but here are some infos that could help find the cause of your problem:

_your graphic card (GPU) model

_your graphic driver + its version

_your version of the game (GOG? Steam? CD? fully patched?)

_your mod list if you installed any

[Sith Holocron 2,480]

In addition to the last post, you also don't mention which game you are referring to: Knights of the Old Republic 1 or 2.

[PheonixKing3000 1]

 

 

I won’t be able to help you, as I don’t know anything about Windows 8, but here are some infos that could help find the cause of your problem:
_your graphic card (GPU) model
_your graphic driver + its version
_your version of the game (GOG? Steam? CD? fully patched?)
_your mod list if you installed any

My bad, here is the system info.

Processor: Intel ® Core i7-4700MQ CPU @2.40GHz 2.40 GHz
Installed memory (RAM): 12.0GB
System Type: 64-bit Pperating System, x64-based processor
Pen and Touch: No Pen or Touch Input is available for this Display

Graphics Card: Intel ® HD Graphics 4600

                         NVIDIA GeForce GT 740

 

Mods: I have a lot of mods installed, not sure how I can list them all.

 

In addition to the last post, you also don't mention which game you are referring to: Knights of the Old Republic 1 or 2.

I am playing Kotor 2.