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The matrix x vvector multiplication is erratic. iq2_bn_r4 is faster at 1, 2, and 4 threads, but saturates to a lower t/s at 8 threads compared to iq2_bn. iq2_bn actually manages 99 t/s at 8 threads and not 93 as I wrore in the last commit. iq2_bn_r4 performance has huge fluctuations at 4 and 8 threads.