I use Cool Reader 3 to read NonDRM EPUBs but it does not show the TOC.
I add my own inline TOC at the beginning of the book to work around that.
I can't say about ADE I don't use it. I have few times accidentally open ADE instead of CR3.
It seem to have the same speed to me but none of my EPUBs are over 1MB
and I have my EPUBs set to split it files if it's over 100kb inside the epub file.
The only slowness I notice is when CR3 is for the first time opening a book. Once it cached it opens much faster.
I think most who do use Lbook's firmware use it for CR3, better contrast and file management options.
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