My understanding is that benchmarking tests shows that 2.4 is faster than 2.6. I believe 2.4 is also considered to be more stable than 2.6. On the other hand, 2.6 is required for the latest Broadcom drivers. My guess is that Victek is attempting to take the best of 2.6 and back-port it to 2.4, perhaps to allow the latest Broadcom drivers without incurring the speed and reliability hit of going fully to a 2.6 kernel. But that is pure speculation.