Why is Facebook javascript SDK slowing down page load speed? -

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we use javascript sdk login , sharing (iframes button). javascript loaded after page load. we're seeing 1.5 3 second slower full page loads facebook enabled. can identify cause , optimize perceived , real page load speed?

  1. make sure js includes after css includes rending
  2. remote javascript loads @ mercy of whoever hosting them. can locally host them, don't latest version, , js includes won't work if they're not included remotely.
  3. try putting facebook include last element in tag. actual facebook logic won't happen until rest of document loads however.

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