Speaking for myself, going from 6.5 to 8.2.2, there was a definite performance hit (opening & closing charts and viewing Imported Items mostly). The few extra second "hang" is really irritating and messing with workflow for me and my staff (if you hit the close "x" on the patient chart window twice in haste, AC quits!) That frustration, plus the new bugs introduced (the inability to attach charts to existing messages, problems with messaging from the sign off window, loss of auto fill in the vaccine window, etc) is clearly not affecting a "small percentage of users". Veteran AC users are just used to motoring through.
The release notes are just business jargon.
