If you ran the original and it only went so-so without mods or patches, then you arnt going to be able to add very much before maxing out your ability. I would say adding the expansions and the patchs would be ok, but much beyond that would probably be too much.
Agreed. The Code Patch and MPP (Morrowind Patch Project) might tidy up scripts and fix some inefficiencies - but, I'm not sure how much (if at all) that will translate into a slight performance boost. In general, the things that tend to impact performance:
- scripts that run constantly
- lots actors and props on-screen
- possibly texture replacers; I'm not sure what the GPU's VRAM is. If it has more vRAM than the recommended specs for TESIII, then you might not see any performance decrease from higher-resolution textures (most GPU's from the past half decade won't have any trouble with higher-res textures)
- possibly high-poly meshes (more polygons demands more rendering resources). Again, I'm not sure if your GPU will be able to handle extra polys with ease, or if it has limitations that will cause a performance decrease. Depends on how high poly you go, I guess.
- Also, in Morrowind, increasing the light sources on-screen (such as from a window glow mod or a mod that adds more lanterns around town) may also decrease performance.
I don't think that quest mods would cause a performance hit, as long as the new cells have about the same item and actor density as most vanilla cells.
Note: I'm not a computer wiz or expert, I'm just speculating from info I've garnered and from my own experiences. In other words: I could be wrong.
If you have another computer system with more powerful hardware, I would recommend installing Morrowind there and adding mods at your leisure. If don't mind playing vanilla, then you could give it a go on your Netbook. If you want a TES game to play on-the-go, you could give Daggerfall a try.