I havn't tried annotating LRF's or PDF's but annotating EPUBs using the built in touch screen 'highlighting' function doesn't seemed to slow down as you described at all.
You just tap and drag to mark the text; the reader tries to look up the text and brings up the option menu (which takes only a second or so); then you pick the highlighter icon to change the selection to a highlight (again only a second or so).
Last edited by delphin; 02-16-2011 at 05:21 AM.
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