Hi !

With the separate process when you render an image you have 2 process ( look in the task manager->process) poser and FFrender, memory usage must be more important for the firefly renderer cause the memory usage of poser is ... separated !!!
 
And, most important, for me, poser is most responsive, you can cancel a render without waiting !

May be something have a better explanation, i've a little problem in english ;-)

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