itunes running slow when changing song names
I have latest 12.2.2 version of iTunes. Have a large library of 1TB+ in an Lacie 2TB external hard disk connected via Thunderbolt. Still every time I want to change a song name or modify information on an album it seems to take forever to do so. The clock appears and eventually will be resolved yet the experience is very different from past versions. Any solution to this issue?
Thanks,
MacBook Pro (15-inch 2.53 GHz), iOS 8.4.1