Hello,
I've just replaced my puter after 10 years (new to Win 10

and 64bit).
I have found Calibre under 64bit (3.7) to be "Glitchy" - that is, it is really slow to start, and when I save metadata (opened via the "E" key) it takes several seconds for it to save. Even some of the columns take a brief moment of time to update.
None of this happened under my 10 year old XP machine. Calibre ran awesomely, so now I'm somewhat disturbed about this situation with the new machine. I have tonnes (we're metric here

) of resources.
Initally, when I first loaded Calibre 64 bit, the save metadata window would take 5-10 seconds to close after adding the info. I loaded the 32bit version and it didn't do this. Going back to the 64bit version, I noticed the Metadata update window was now closing in half the time. I also found reverting to default icons helped. Did the 32bit version somehow impact the 64bit one (make it better a little)? I have no real idea how all this fits together.
Any ideas on what could be going on? I have been on 1.48 for so long that a lot of this is new to me. I'm not even sure where I should be looking. I did find one other post on here about a similar issue quite some time ago, but not real sure there was a solution.
I did a fresh install of calibre 3.7 64bit, then re-installed all the plugins from scratch by downloading them. I pointed to me original library (it has the same number of books that ran perfectly on xp).
Scratching my head somewhat.
Any insight is greatly appreciated. Thanks