Valkyria Chronicles 2 - ULUS10515

[nightflyer]

It's been a while since I last played this game(some revisions ago) but on my system it was fully playable.
From the settings 'Use only GE Grapics' made the most impact(have you played around with the settings already?).

You might try theese settings as suggested by hyakki earlier in this thread:

[-] = Unchecked || [x] = Checked

|Video|
[x] Only GE graphhics (not recommended for homebrew)
[-] Use vertex cache
[x] Use shaders (experimental) # (NVIDIA Speedup) | (ATI Buggy / Disable)
[x] Use a Geometry Shader for 2D rendering (only relevant when using shaders)
[-] Disable UBO (automatically disabled if not supported, only relevant when using shaders)
[-] Enable VAO (only relevant when using shaders and vertex cache)
[x] Enable saving GE screen to Textures instead of Memory
[-] Enable decoding of indexed textures (using CLUT) in shader (only relevant when using shaders)
[x] Enable dynamic shader generation (only relevant when using shaders rec for AMD/ATI)

|Media|
[x] Use Media Engine (Works only with 32bit JPCSP)
[-] Extract media files to tmp folder
[x] Decode audio files with sonic stage (you must have ss installed for this to work)
[-] Use non-native fonts from flash0 folder

|Compiler|
[x] Use compiler (dynarec)
[-] Output profiler into to profiler.txt (only for compiler)
[100] Maximum method size

Other than that, you might try using JPCSP-Launcher, it really improved playability for me.