Performance degradation after upgrading to 4.4

I totally understand your reluctance to upgrade until you see some progress on this issue. If your downgrade was less than one week ago, you may still have the forensic data (FTDC an log files) needed to do an analysis. If it was longer than that, it will be difficult to do much.
The side note about a corrupted database due to FCV issues did pique my curiousity – if you have any more information about that issue please file a ticket.

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