nginx eval with memc set command very slowly

[yaoxinming]

when use eval with memc  set(all dev by agentzh ) ,I feel the response is
very slowly,but get is very quickly,below is the configue

location /myset {
    eval &var1{
          set $memc_cmd 'set';
          set $memc_key 'test1';
          set $memc_flags 12345;
          set $memc_exptime 24;
          set $memc_value 'my_value';

          memc_pass 127.0.0.1:11211;
      }
  }

does any one has meet this problem,any advice is welcome
thanks very much
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