grep length, values %a

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is even faster. 
          Rate      OP   other fishbot   Joost ikegami
OP       186/s      --    -34%    -67%    -88%    -90%
other    280/s     51%      --    -51%    -82%    -84%
fishbot  571/s    207%    104%      --    -64%    -68%
Joost   1578/s    750%    463%    176%      --    -12%
ikegami 1798/s    868%    542%    215%     14%      --

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In reply to Re^4: Count non-empty hash values by ikegami
in thread Count non-empty hash values by pboin

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