running 9.04 TS1M2, but yes we did a pretty significant upgrade about 6 months ago. honestly, i wasn't really paying attention to performance until recently.
we got visual analytics/ statistics / imstat and a 8 node grid. our analytic server is the same, but i suspect something with this grid is corrupted. we have had a lot of weird issues during and after this implementation.
the other thing i can think of is we tried to increase the disk space of work by adding some space from the san. work is all ssd. the san is emc vnx 5800 which is also really fast. our thought was if work got filled up the san would then kick in. what we eventually noticed was it wasn't working this way. work was being randomly asigned to ssd or the san. so we changed it back to all ssd.
i know, and my admin doesn't know where to look, and he's a really smart guy.
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