Adslahnit

Bags: I'm still in the BG1 portion, so no bags yet.

NPC Quests: I'm soloing through the game (to potentially minimize lag).

Well, that doesn't really help pinpoint the cause of the stutter, now does it?

I recently just did a MegaMod install of BG. Problem is, the stutter bug has struck, making it very hard for me to play. FRAPS reports an FPS of ~20 as opposed to my set option of 60 FPS. I've already tried the Baldur.bcs from the sticky, but it doesn't really help solve the stutter problem. My BG is configured to run with the best graphical options since my computer could handle it previously. Also, I'm not running any background programs while playing BG, so that can't be the problem. Here are my computer specs:

Windows Vista Ultimate (Aero disabled)
Intel Pentium 4 CPU 2.80GHz
1 GB RAM
ATI Radeon 9600 SE (Latest drivers for Vista)
Creative Audigy 2 Gamer ZS (Latest drivers for Vista)

And here is my WeiDU install log:

// Log of Currently Installed WeiDU Mods
// The top of the file is the 'oldest' mod
// ~TP2_File~ #language_number #component_number // [Subcomponent Name -> ] Component Name
~SETUP-DOS25.TP2~ #0 #0 // Desecration of Souls 2.5 <------ Use v2.6
~SETUP-TACTICS.TP2~ #0 #16 // Ishan's "Always Toughest Random Spawns in Dungeons" <--- Not sure how this changes your game, but different than what I use.
~TB#QUEST/TB#QUEST.TP2~ #0 #2 // A large battle <--- Need Refinements
~SETUP-UB.TP2~ #0 #18 // Restored Minor Dialogs <--- Will corrupt AR1303. Don't Use!
~SETUP-BPV177.TP2~ #0 #15 // Ascension for BP <--Use Weimer's Ascension & install prior to BP
~SETUP-D0TWEAK.TP2~ #0 #2 // Corrected Demon Animations <--- Deprecated by BG2 Fixpack

This is all I see offhand. Your hardware should be fine.

Alright, I'll take note of all that and do what you recommend.

For the "Always Toughest Random Spawns" components of Tactics, how exactly might it interfere with the other mods? Should I install it last next time or should I keep it as it is in the current install order?

Well, the stutter bug is still there. I'm already up to Chapter 4 of BG1 (very hard with all the lag), and the stutter is definitely not helping.

About the AI, it doesn't really seem to matter if the AI is turned on or off. The amount of stutter is just the same either way.