My ongoing gripe remains on populating the Dashboard.  Sometimes it works and sometimes it goes to the never-ending spinning thing.  I generally have ~6 reservations at any given time and rely on that dashboard to refresh my memory on the details as I often move things around.
I'm logging in using a carefully maintained MacBook Pro with Safari.  I routinely monitor for malware (etc) and keep up with patches.
And yet, the Dashboard remains, for me, a persistent struggle.  Somedays it works quickly ... other days it is either "slow" or "doomed to fail."  I got two of those three even today:  quick!  and "doomed to fail."