Actually, I haven't yet experienced this lag. I have about 800 notes on my Reader (PRS-600) at the moment. Most of my notes are highlights and keyboard-input (not drawing-input). Adding a highlight or notes with the on-screen keyboard is usually relatively fast; occasionally there will be a delay of a few seconds. I seldom use the "draw" type of annotation, but when I do have only sometimes noticed a small delay. I do however notice a very lengthy delay whenever I use the "eraser" function in the annotation screen.
Also possibly relevant is that I hardly have any PDFs. Almost everything is in EPUB or RTF. And in total, I only have 44 books on my Reader, and the most heavily highlighted ones are journal article-length, not book-length. Lastly, I do not use the Sony software on my computer. So, maybe one of these many variables is why I've not experienced a lag.
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