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Although I don't know why a 3GB VRAM GPU would have problems with it, the symptoms you describe read to me like your VRAM is maxed out.
- Could be a slow hard drive. Not sure how it's configured, but if youhave a 5400rpm drive it could slow down a little while loading stuff for a new area.
- Double check the Optimus settings and make sure the game is using the Nvidia GPU and not the integrated Intel on the CPU.
Mods with lots of NPCs can cause a problem too.
Is Skyrim on a platter drive, same drive as OS?
It kind of is the nature of the beast, Skyrim cannot use all that much RAM or VRAM and when it hits a new area it can lag a bit while it loads new textures.
I have Skyrim on a SSD (seperate to Steam and OS) and that makes a big difference.
Check your load order with BOSS, use a texture optimiser such as:
http://www.nexusmods.com/skyrim/mods/12801
Check out STEP.
http://wiki.step-project.com/Main_Page
Try this. Open nvidia control panel and click on manage 3d settings and select skyrim. God to the bottom of the list and force vsync on. Even though I never changed it in the ini, this made a different. Then click adjust image settings with preview then select use my preference emphasizing balance. Keep your skyrim settings at ultra. Give this a try and see what happens. If you have a way to check your FPS, that would be helpful too.
This here is a stupid answer to anything. Alienware may be over priced, but it works just as good as any other computer.
2. Check that the hardware and software for the card is setup correctly for gaming. That the intel graphics isn't being used (as bu-chengshi has mentioned) and that the card is using all the RAM/ VRAM it can.
3. Download Skyrim Performance Monitor from nexus.
http://www.nexusmods.com/skyrim/mods/6491
At the moment Nexus server is having some issues but both this link and the previous do work.
4. Run Skyrim Performance Monitor and Skyrim Vanilla and then Skyrim with the Official hires packs and see if there is any difference with RAM and VRAM usage. Run around a bit covering the same area in each try. There should be a difference between them, if they are the same * then there may be a limit happening with the way your card is setup.
Edit: * the same and both very low.
Other possible solutions.
Lessen your shadow quality.
Frame limiter. Try 32 or 33, don't try 30 as that has been known to cause issues.
Turn off AA etc in game, run through card software only.
enbboost
Laptops usually have 5400 RPM harddrives, which is slow for gaming and will cause loading issues.
Kazuki, when you say "lag" just how much lag are we talking here? That could mean anything from a 10% drop in framerate for two seconds to the game freezing for five seconds every time a new kind of tree gets into view.
I'm surprised you can get Nvidia System Tools to work with a GT 750m, because the site says it only supports up through the 500 series GPUs.