OBEX USB stream

I need to transfer image files from PC to phone at high speed. I partially accomplished this task by writing a VB.net application which writes the file to phone filesystem using OBEX, and a python application on phone which reads and displays the image.
But obviously the result is quite slow (around 5-6 FPS).
I need at least 15 FPS, so I'm looking for better implementation. I guess bypassing filesystem access could quite improve speed, but I don't know it phone can directly access OBEX data before they're written to filesystem: is it possible? How?

I'm using an s60-2nd phone.