Fusion Drive, 27" iMac lags, slow

I'm using a new iMac with 3Tb fusion drive (16Gb RAM) to run Final Cut Studio 3 (fcp7).
The experience is slow and laggy. Commands in the top menu (File, Edit, View, etc) require 2-3 seconds for the menu to drop down, and I get a spinning beachball while I wait.
I'm wondering if I can get the app I'm using to load onto the SSD portion of the drive, although I know there isn't anyway to control this. Apple says, the machine will just know what apps I'm using frequently, and move files in the background to increase the speed.
It's been three days with FCP open nearly all day, and still it lags. (Commands like SAVE shouldn't result in beachballs)
Is the new iMac or fusion drive unsuitable to run FCS 3?
Switching to a different editing software is not a reasonable option for me currently.
Should I trade this macine in favor of a spinning drive instead?
Any advice and insight will be apreciated.
thank you.
-T

update: My slow video edit issue doesn't seem related to the Fusion Drive in my 27imac. Problem was solved by running FCS under a different user name.
Not sure exactly what the problem was, but since it's a new machine, starting a new user wasn't difficult.
And the machine is very noticeably more zippy. Boots and app launches are excellent.

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