6,900 tracks at a touch over 42 gb.
The vast majority of it is MP3s at 256 or 320k. There are some flac albums (mostly Beatles and Grateful Dead) and I'm slowly going through my CD collection and selecting some which I think will be better served (listened?) as flac.
I see no slowdowns or performance hits with MusicBee. I really have nothing to compare it with as I, like most of you, used a good number of players before discovering MB. But I didn't put much time or effort into ripping my collection up until MB appeared. It was just too much work. So I had tracks ripped that I wanted to listen to on my computer and I didn't care much about tagging them with anything other than the title. When I was in other rooms of the house, I listened to the CD. Now, with the addition of two Squeezebox devices, I'm incredibly happy that I have been using MB since April of 2009 as my collection was (mostly) properly tagged and ready to play on the Squeezes.
And to that I have to give a tip of the ol' phred hat to Steven. And to a good number of forum members who have offered suggestions, either directly by answering my questions, or by my reading what they were suggesting to someone else. Thank you all!!