From testing, the largest Audio Weaver crossover I have worked with to date went from 91% to 50% throughput. A 1.82:1 speedup. This includes the overhead needed for running all the dspNexus 2x8 controls.
Have not tried the FIR side processor that runs in parallel to the normal DSP processing in the ADSP21569, but the number of taps available with the external memory should be interesting for trials.
Will be trying the firmware flash process for my block diagram to verify operation.
So far, so good.