I found this in another forum and thought it was worth posting. It has a few of the problems that we have been experiencing and some explanations for what they are worth.

(Quote) >>>>> Some of the problems they've had is:
1; too slow splitter, more splitters added. too slow transitioner, partial fix more transitioners added.
2; database I/O-limited, turning off displaying of pending credit and such decreases the load.
3; code changes squees a little more out of the database, but unfortunately a bug was added. Yes, on this point you can complain.
4; fastcgi refused to work with something that worked in alpha, and also works in "classic"...
5; too many files in upload-directory, work-around needed to disable the validator. new code is tested before being implemented in "live" project.
6; the new Snap-box lead to raid-corruption of the database; reverting to the backup taken before copying to new box since the Snap was up less than a day, and probably to make sure the database isn't corrupted.
7; every copy or fix-script or restore runs slower than expected, so takes longer than expected to be up again...

1 & 2 doesn't show up in beta, 3 is Berkeley-error so should have been tested, 4 was tested but still didn't work, 5 is still waiting for the fix being tested before validator being turned on again, 6 is unexpected hardware-problem, 7 everything going slower than expected is actually expected... (End Quote)