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How to sum up this list fast, Total, Fold is still slow to me


Hi, guys
      i am trying to sum up a large list of 24,000 elements which are very
small. See the attachment for details i have tried

[ contact the author to get the attachment - moderator]

Plus@@longlist
or Total[longlist]
or Fold[Plus,0,longlist]
but it is still slow to me

How to tackle this problem
 Thanks for your help



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