Slow boot on Mac Pro

I've got a mid-2010 Mac Pro that has a very long boot time.  Here is what it is doing:
Power on
Blank screen for 35 sec then boot sound + grey screen
At 1 minute I get the apple
At 1:10 get the spinning circle
At 1:39 get the login icons
This seems far far to long for this machine.  It has awesome specs so I would think it is a lot faster:
2x6 core CPU's
96GB RAM
1TB SSD boot drive
12 TB internal stripped volume
Two ESATA cards with 5-bay Drobo's on it
Whatever fast video card they came with by default
I've tried reducing the ram to 64GB (which was once the source of a problem with an OS upgrade).
I've disconnected the ESATA drives.
I've removed the ESATA cards.
I've reset the PRAM
I've reset the SMC
The ESATA cards in particular with the Drobo are VERY slow, so that is why I thought pulling them might resolve the issue (they don't have great support in the Mac Pro, but they do work).
I'm at wits end here.  This thing should scream.  My MBP retina 15"  with SSD boots very fast and I would have expected the Mac Pro to boot similarly fast.
The SSD is attached to the same cable that the DVD-RW drive is on (i.e. that cable has two heads and the SSD is on one of them).  Could this be the issue?
Any help?

Still has quite a bit of space free.
No, that is what Mac OS X says. But it is calculating for Rotating Drives.
Mac OS X deletes a block and adds that block to the Free List (it does not erase it). The amount of reported Free space it reports is adjusted.
Without TRIM, the drive is not notified that the data in that block has been deleted. On a Rotating drive that has blocks pre-allocated and pre-numbered, that is not an issue.
Without TRIM on an SSD, which requires an erased SuperBlock to write anything, it is still carrying the deleted data as if it were good. When a write comes down, it tries to find a Free SuperBlock to write into, and when they run low, it is forced to revert to Read-Modify-Write cycles (much slower) to get anything done.
If you have run a Speed Test, you have written many blocks to your SSD. Unless TRIM is enabled, all that data are still carried along, even though Mac OS X will Never reference them again except to overwrite those blocks (which the SSD does not literally do, it writes a SuperBlock instead).
However, when I ran a disk utility repair on the old one mounted in an external ESATA dock, it didn't give the message Trimming unused blocks".
Enabling TRIM for a specific Drive makes a change in Mac OS X, not in the drive or the Driver that is loaded off the drive. In order to effect the Big TRIM, you would need to have ALSO Installed and Enabled TRIM for that drive on your alternate Mac OS X. TRIM cannot be Installed in a Recovery_HD (at least, not yet).

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