AE performance with AJA / Blackmagic video output

Hi,
is there any way to improve the performance of AE when working with video output? I have an AJA Kona LHe installed on one workstation and a Blackmagic Decklink Studio on a different workstation. I work with 1920x1080 DPX-sequences most of the time. RAM-Preview works fine (means realtime) when I deactivate my video-preview. But with video preview activated I get a frame rate around 15-20 fps.
I know that AE is not supposed to provide a perfect video preview in realtime, but is there any way to improve this a little bit?
Fun facts:
- when turning my quality to half or quarter, the frame rate is even lower (around 10-15 fps)
- different source material acts different...quicktimes give me realtime sometimes, dpx sequences result in 15-20 fps. I mean - AE is putting the comp into the RAM ("RAM-Preview") - shouldn't it make no difference what source material in my comp is?
Thanks!

*push*
Exact same issues here! We just rented an AJA IO Express to test it before buying and the tests were not very satisfying! Furthermore, when you make a RAM-preview of something with audio, the audio plays at the correct speed of course and the video at the above mentioned 15fps! So the audio of a 30sec-Spot ends about 6 seconds earlier than the video!
For almost 1 and a half years no response with a solution... Could maybe someone from Adobe tell us, if there is any by now?
Thanks!

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