I was thinking more in the lines of corrupted AR8700.are or creature resources. This could explain the crash at least.
Potential problems could be about anything, including a bad lightmap or ambients (these can be nasty).
But it sounds more like you have a flooding problem, which is why it would be interesting to see if any of your mods changes the gibber.cre for instance. (I know I had no lag with 30+ gibberlings on the screen when I fought them)
My gibber.cre changelog looks like this (for reference):
[codebox]
Mods affecting GIBBER.CRE:
00000: /* from game biffs */ ~SETUP-
BGT.TP2~ 0 0 // Baldur's Gate Trilogy - Core
00001: /* from game biffs */ ~SETUP-
SCS.TP2~ 0 5000 // Smarter general AI
00002: ~SETUP-
SCS.TP2~ 0 5024 // Three quarters of the potions dropped by slain enemies break and are lost
00003: ~SETUP-BPV177.TP2~ 0 0 // Big Picture AI/Enhancement Mod, version 177
weidu (beta)
00004: ~SETUP-REVISEDBATTLES.TP2~ 0 27 // Modify .CRE Proficiencies, Abilities & Effects. This component MUST be installed.
00005: ~SETUP-BGTTWEAK.TP2~ 0 2400 // Enemy items shatter
00006: ~SETUP-XPMOD.TP2~ 0 1 // Reduce to 50%
00007: ~AURORA/SETUP-AURORA.TP2~ 0 0 // Aurora's Shoes and Boots
00008: ~AURORA/SETUP-AURORA.TP2~ 0 440 // Both 1 and 2 (50% of treasures lost)[/codebox]
Edited by OneEyedPhoenix, 15 October 2009 - 01:55 PM.