In the echo hash I replaced 4 shift and 3 eor operations by 1 mul, I also removed 1 andmask by using an eor trick.

OLD:
         uint32_t t;
         t = ((ab & 0x80808080) >> 7);
         uint32_t abx = t<<4 ^ t<<3 ^ t<<1 ^ t;
         t = ((bc & 0x80808080) >> 7);
         uint32_t bcx = t<<4 ^ t<<3 ^ t<<1 ^ t;
         t = ((cd & 0x80808080) >> 7);
         uint32_t cdx = t<<4 ^ t<<3 ^ t<<1 ^ t;
         abx ^= ((ab & 0x7F7F7F7F) << 1);
          bcx ^= ((bc & 0x7F7F7F7F) << 1);
         cdx ^= ((cd & 0x7F7F7F7F) << 1);


NEW:
         uint32_t t, t2, t3;
         t = (ab & 0x80808080);
         t2 = (bc & 0x80808080);
         t3 = (cd & 0x80808080);

         uint32_t abx = (t >> 7) * 27 ^ ((ab^t) << 1);
         uint32_t bcx = (t2 >> 7) * 27 ^ ((bc^t2) << 1);
         uint32_t cdx = (t3 >> 7) * 27 ^ ((cd^t3) << 1);

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