@astra: There are lots of threads where this is discussed. LRF is a highly limited format and the calibre LRF converter is one big hack. One major example: LRF doesn't have support for italics, substituting an oblique rendering of the base font, with rather hideous results.
To the OP, you def should not see any thing more than a sec or so delay moving linearly between chapters. Sounds like possibly some pathological HTML. If you try a different book and get the same results, please create an issue on the calibre trac.
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