Not really a question but more a hint I'd like to share with you. I've recently managed to get quite a performance boost on a complex workspace by replacing some ImageRasterizer transformers with MapnikRasterizers. Along with some other tweaks in the process I've gotten the processing time on FME Cloud cut back to 7 minutes where it originally was 14 minutes.
So in short: if you have a workspace that uses an ImageRasterizer and takes a lot of time, try it with a MapnikRasterizer