Try changing gpu frequencies using stweaks. Samsung defaults are 160, 267 while siyahkernel has 5 steps starting from 66 to save battery.
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In the past for a couple of months Siyah had CPU frequencies that could go as low as 50MHz. Now it is back to 200MHz. I think there were good reasons for it. I'm guessing that coming from deep sleep such low speeds don't have a great advantage for battery life, but that performance is better with 200MHz as lowest speed.
When I was on CM9 and CM10 with Siyah v5.0.1, graphics were stuttering when beginning to scroll a list or starting to zoom in Maps (precached tiles) and Sygic Navigation. When I raised the lowest GPU speed from 66 to 108MHz, the stuttering was gone.
So now I'm wondering why the GPU speed was lowered compared to its former higher speeds? Or doesn't the GPU go into deep sleep like the CPU?