OK, I experimented a bit. I converted the original epub to mobi, then converted the mobi back to epub, and the new epub displays fine, no huge delays. The new epub is also considerably smaller (but I don't notice anything missing when I read it):
orig versus epub->mobi->epub:
-rw-r--r-- 1 tom users 715135 Sep 2 19:39 Eric - Terry Pratchett.epub
-rw-r--r-- 1 tom users 191426 Sep 2 19:48 Eric - Terry Pratchett.epub
so I guess I have a work around even if I have no idea why the original book suddenly got so slow.
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