GSDX: Low FPS in Shadow Hearts under HW modes

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1) Did the game ever work correctly (i.e. not have this problem) on the
Official PCSX2 build or an earlier version of PCSX2 playground?
Doesn't seem so. In HW mode that is.

2) What steps will reproduce the problem?
1. Use GSDX plugin in HW mode
2. Load the game and reach a 3D on 2D-background scene.
(Just start a new game and skip the videos until you can play)

3) What is the expected output? What do you see instead?
Expected, higher framerate. Instead, the game seems kinda capped at ~23
FPS. During battle however, the framerate is alright.

4) What version of the product are you using? On what operating system?
Tested with r2650, and 0.9.6.

5) Please provide any additional information below.
It runs at over 100FPS in Software mode in that section.

Also, in HW mode, there's a flickering if no deinterlacing is used, and
weird banding if deinterlaced. Like with FFX-2's videos, but while in
battle. Again, using Software mode there's no issue.

Original issue reported on code.google.com by KrossX3 on 2 Mar 2010 at 7:15

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Dang.. used the wrong Browser tab. 
*sighs* =_="

Original comment by KrossX3 on 2 Mar 2010 at 7:18