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itimpi · 08-12-2011, 12:44 PM

I do not think there is a definitive answer to this as the Kobo firmware appears to be prone to freezing.

One thing that I have seen reported as helping reduce the likelihood of a freeze is reducing the maximum size of the individual HTML files inside an ePub. This is set in Calibre under Prefernces->Conversion->Output Options ->ePub, and the default value is normally 260KB (many readers require it to be less than 300KB). You could try taking a problem ePub and do an ePub->ePub comversion with this value set to something like 200KB (or even 150KB) to see if that helps. With the latest Calibre you wil find that your existing Epub is renamed as Original_ePub so that it is not overwritten in an ePub-ePub conversion (as used to be the case).

I do not have a Kobo myself so cannot test this out. If you attempt this then please report back as to whether it helped or not.

08-12-2011, 12:44 PM	#2
itimpi Wizard Posts: 4,553 Karma: 950151 Join Date: Nov 2008 Device: Sony PRS-950, iphone/ipad (Marvin/iBooks/QuickReader)	I do not think there is a definitive answer to this as the Kobo firmware appears to be prone to freezing. One thing that I have seen reported as helping reduce the likelihood of a freeze is reducing the maximum size of the individual HTML files inside an ePub. This is set in Calibre under Prefernces->Conversion->Output Options ->ePub, and the default value is normally 260KB (many readers require it to be less than 300KB). You could try taking a problem ePub and do an ePub->ePub comversion with this value set to something like 200KB (or even 150KB) to see if that helps. With the latest Calibre you wil find that your existing Epub is renamed as Original_ePub so that it is not overwritten in an ePub-ePub conversion (as used to be the case). I do not have a Kobo myself so cannot test this out. If you attempt this then please report back as to whether it helped or not.