In optical communication the non-ideal properties of the fibers lead to pulse widening from chromatic dispersion. One way to compensate for this is through digital signal processing. In this work, two architectures for compensation are compared. Both are designed for 60 GSa/s and 512 filter taps and implemented in the frequency domain using FFTs. It is shown that the high-speed requirements introduce constraints on possible architectural choices. In this work, it is shown that it is not required to use two overlapping FFTs to obtain continuous filtering. In addition, efficient highly parallel implementation of FFTs is discussed and an unproved FFT compared to our earlier work is proposed. The results are compared to using an approach with a shorter FFT and FIR filters.