Improve text only rendering time I need to render a small (30s), text only scene, in a very fast way. The result needs then to be added on top of a multilayer exr frameset, to produce the final video.
I'm using blender-internal, and having already disabled raytrace, textures, AO, etc... the question is: what can be done (maybe at code level) to reduce the rendering time as much as possible? 

Many thanks,
Regards GLoureiro
It seems like you have done some of things I would have already suggested.


Use Blender-internal or OpenGL render.
Reduce anti-aliasing samples.
Use a shadeless material
Don't use any lamps.
Tweak text resolution (for fewer triangles)
Experiment with tile size (larger tiles may give better performance)
Lock the user interface while rendering.
Render from the command line. (means you can't use OpenGL easilysee  Render with openGL from the command line? )
Check which formats save to disk fastest (PNG with low compression is quite good).