jit.matrix 512 list performance issues

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Max Patch
Copy patch and select New From Clipboard in Max.

I have 4 to 8 of these patches in ableton and when automating it turns the CPU crazy. Posted in the main forum as it seems to hang the cpu even outside of ableton.
Making it clearer, I have the left first pak list with faders in a midi track *8 times and the receiver jit.matrix in a return audio track.

I'm in a 2012 retina macbook pro with 8 cores and I don't know how to debug performance issues in such a simple patch. Is it the UI faders, refresh rate, float or int? don't know :(

What could be a simpler, less CPU intensive way of doing this?

Wonder if someone here could help and simplify of what I could be doing wrong.

Thank you in advance
John