Therefore, could I use Zefie's kernel with the AospCM ROM?
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Most likely.
Zefie's later kernels were designed to handle 2.3, the problem is that CM roms are very integrated. They don't follow what a standard 2.3 will be, so you can't always swap parts out as easily as you can with other roms.
Give the kernel a try, just be sure to make a nandroid backup first, although odds are you will only have to re-flash a working rom or kernel to fix it.
The reason I asked about performance is that many are basing this on Quadrant which is actually not giving an accurate number on roms with Stagefright enabled. It's inflating it to almost double what it should be, due to a stagefright incompatibility with our phones. Based on Quadrant you will see a HUGE gain with AOSP over a rom like Aphrodite, when it's simply not true. If the phone was twice as fast, you would know it!
Most roms are equal to a 100-150mhz overclock over stock, and that is noticeable. We then overclock that... For a stock rom to run as fast as Aphrodite at 806mhz, it woudl have to be overclocked to almost 1000mhz (yes, it's that dramatic). If you were to double the speed of Aphrodite, the phone would absolutely scream, and frankly, they don't. There is very little difference in speed between the current crop of the roms, yes you can see small differences with benchmarks, but in terms of how much you or I can "feel", it's non-existent.