DrawImage performance

Are there any settings that affect rendering performance of calling DrawImage()? Currently rendering paths are quick but drawing images are fairly slow (150-300 millisecond range depending on size).

I ask about settings due to seeing the link below about GDI+ DrawImage performance and was wondering whether there are equivalent or relevant settings that affect GraphicsMill. Even if it reduces the quality.

http://stackoverflow.com/questions/11020710/is-graphics-drawimage-too-slow-for-bigger-images

Other than settings, is there anything else i can do to improve performance of this? One thing i will try is to convert the image to match the same pixel format (RGB to cmyka). Should this help?

Thanks

Just an update:

Drawing a 5000x3333 pixel image cropped to a few hundred pixel area was taking 300-400 milliseconds and applying a scaling transform to stretch it to fit made it take 10x longer at 3350 milliseconds!

I've found a better approach which is to take a copy of the large bitmap, resize it using the low quality option to make it match the exact target bitmap size and just draw it on the target bitmap with no transform. It is now down to the 100-200 millisecond range.

There are probably a few more optimisations that i can make as well such as caching off the resized intermediate bitmap and possibly doing all rendering on a separate thread to keep the UI smooth.