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					Originally Posted by theducks  Hmmm!
 You are observant.
 Arrowing the list in Sigil is way more sluggish than Calibre
 
 How many dictionaries are enabled?
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 Only 'observant' because I don't use the mouse 
Two real dictionaries (English and French) - both much larger than the dictionaries shipped with sigil and calibre -  I found them at Apache (I think).  Some smallish user 'dictionaries' in Sigil, none in Calibre because I don't ordinarily use its spell checker. 
Calibre is much slower loading the dictionaries. I can't discern any tangible difference between traversing its list of mispelt words and Sigil's - one's like porridge, the other's like treacle 
 
BR