I just took a look at AoXo's log file that was posted a while back already ....
I noticed a couple of things ... a bunch of plugins are being called, autoimport is on and it is
analyzing files on import. IMO whether you have a large library or even a medium sized one say over 80k files you should not be analyzing things on import especially if they are video or high res files
certain views (790 k records almost) are taking almost 6 seconds for just the "array" to complete -- the biggest view I have, with some regex is 110K, that is loading in less than 600 msecs and you are running an i7 (I'm running a slightly faster, but i5 machine ....
There were I believe some things changed in autoimport regarding cue files in the 40's ... now if you don't use cue files that should not affect anything, so maybe by process of deduction this can be figured out.
Have all of you tried :
Turning off autoimport to run in the background ?
Launching without third party plugins old skins?
Turning off auto-sync with server from a client?
Turn off TV services? (lots of changes to that part of JRiver recently)
Turning off the memory playback option?
BTW ... Do you have multiple machines launching mediaserver on your networks?
Now I have neither the expertise nor any logical explanation as to why MC ran fast before and now it is sluggish. Matt can confirm but I am guessing that something was changed in autoimport to correct the cue file problem .. autoimport is going to slow things down depending on how it is configured. I'd be interested in see a log without autoimport on and with autoimport on but with no analysis or tagging options going on in the background
Anyways just my 2 cents so take with a proverbial grain of salt