Final Fantasy IV Complete Collection - ULUS10560

[gid15]

here is a new profiler.txt, I reset it right before the battle screen and closed the emulator right after
Edit:
I added another profiler from another boss scene it seems to be slightly different instead of _S1_2_88F8DD0 , _S1_2_8A20374 was higher % this time)

(btw when Enable saving GE screen to Textures instead of Memory the screen loads 50% faster (still slow though), but turning that on breaks the color mask / stencil test option needed for the text :p)

I've seen that these scenes are mainly using indexed vertices (GU_INDEX_xxx):

Code:

GU_TEXTURE_32BITF|GU_NORMAL_32BITF|GU_VERTEX_32BITF|GU_INDEX_8BIT|GU_TRANSFORM_3D size=32: used 224556 times in PRIM, average 1030.1 per GE list

This is not implemented efficiently in Jpcsp and probably the reason for the slowdown. Does using the Vertex cache help? You can just try to enable it during this scene.