I used to have a lot of annotations on the 600. Several hundred, and I never experienced any slow down. I annotated a mix of of PDF and EPUB ebooks.
Saying that, annotating was slow to begin with on the 600 anyway, but nothing like what is being described on this thread. It did not get slower with more annotations.
One point is, I religiously kept all my ebooks on an external SD card. I kept the base memory totally free.
I have a 650 now. I notice no slow-down, but I haven't annotated much.
Incidentally, how do you save annotations to hard-drive?
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