Hi, Katsankat.
I get around 212 FPS when facing all the NPC, 522 when they are hidden.
I saw that you used the basic "room" given in the SDK.
Just started from scratch one quickly in 3DS, just for fun. They have the same size. I used Giles 2.0 to lightmap it quickly.

If you want to use it before doing a basic level, it's free...
Link:
http://www.clavet.org/forum/download/file.php?id=89
3Mb file, containing a B3D final mesh, the 3DS startup mesh and a Lightmap source (Giles 2,0) - Gls