Very slow external disk read/write speeds on iMac?

My late 2012 iMac has slow I/O speeds on USB3 (~90MB/sec), FW800 (~50MB/sec via Thunderbolt adapter) and Thunderbolt (~110MB/sec).  I've tested it on several drives using the BlackMagic Disk Speed Test.  I'm on Mavericks 10.9.2. 
The internal disk (not SSD) is faster than all of the others at ~150MB/sec.  I don't know where to go for help with this.  Anyone have any suggestions as to what the problem might be?
I'm using this computer to edit HD video and these speeds are just unacceptable.  I've tried both a Sans Digital FW800 RAID array (RAID 1) and a brand new OWN Mercury Elite Pro Thunderbolt RAID 1 enclosure. 
Thanks!

Your drives shouldn't be running this slow, especially the USB 3.0 and Thunderbolt drives. Period.
You have some hardware issues going on.
Before SSDs, believe it or not,  video was edited using mostly 7200 and 10, 000 RPM hard drives.
Usually with FireWire 400/800 drives.
I create and edit video with Final Cut Express 4 using the internal hard drive with two external FW800 drives connected and working and I am not having the issues you are having.
Although, I am, also, using an older 2009 27 inch screen iMac with 16 GBs of RAM running OS X 10.6.8 Snow Leopard.
Also, I forgot to ask, how much RAM installed in your Mac?
I suspect You have either a hardware and/or hardware/software issues.
It would help us to help you if we could have some more technical info about your iMac.
If you wish, Please download, install and run Etrecheck.
Etrecheck was developed as a simple Mac diagnostic reporting  tool by a regular Apple Support forum user and technical support contributor named Etresoft.
Etrecheck is a small, unobstrusive app that compiles a static snapshot of your entire Mac hardware system and installed software.
This is a free app that has been honestly created to provided help in diagnosing issues with Macs running the new OS X 10.9 Mavericks.
It is not malware and can be safely downloaded and installed onto your Mac.
http://www.etresoft.com/etrecheck
Copy/paste and post its report here in another reply thread so that we have a complete profile of your Mac's hardware and installed software so we can all help with your Mac performance issues.

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