Feedwordpress Fatal Error

Hi everyone. I’ve been using feedwordpress to syndicate blogs on my site, and no matter what I bump the memory limit up to (it’s 200M now), I always end up getting a fatal memory limit error. Does feedwordpress use up a lot of memory, if so, is there a way for me to manually ‘dump’ this so it doesn’t build up?

My site is http://fashion.iheartsl.com it’s currently syndicating over 500+ blogs, is that too much for the feedwordpress plugin to handle? Any help would be appreciated, thank you!