I have about 6k books in calibre. Calibre appears to have performance issues sometimes.
I also have about 700 books in Marvin and more will come. So far, Marvin's library performance is more than ok for me.
I considered going via delete/reload via OPDS(Calibre is configured to provide OPDS via Internet, I use iPad 3 with 3G) but...I DO use highlighting/commenting features of Marvin and don't want to play games with export .mrv files, import them back,etc
Anyway, it's much faster to search something in marvin than to query via OPDS.
Marvin is great!
I hope iPhone version's performance will be at least same on iPad for me
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