[cybmole]

a simple test would prove/disprove avg as cause, just temp disable AVG completely & re-check book loading speed, re-enable after the test.

another simple test would isolate calibre's contribution to any delay: try loading the same problematic book(s) but this time don't use calibre, do copy / paste from calibre library location to sony drive, in windows, & time that process. i.e. same hardware path, different software in charge.