Raster Theme with "Oracle Map -mapviewer ajax"

Hi, Everyone,
I tried to add a raster theme by using "Oracle Map".
If I add my raster theme as based map, the mapviewer will correctly render image.
If I add my raster theme as a FOI theme layer, the mapviewer will not render the raster image for me.
Does anyone know if "Oracle Map" supports raster theme, or just vector theme? I just want to make sure if I am right on tract.
TIA

This didn't solve the problem.
tile size is 2048 X 2048 where as map size is 800X800 but when a request is made, it fetches around 9 tiles.
If I reduce the tile size to 256X256 it fetches around 33 tiles and from logs for each jpeg fetched querying/rendering time is 15 to 25 seconds.
So it takes around 2 minutes to complete one request.
It is too high, what can be done to improve mapviewer's performance with georaster themes?

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