Description:
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Calling move uploaded file on a file uploaded to the standard /tmp folder. Uploaded file size was 2.8m, but that function took about 5-6 seconds to complete. The copy function is a good workaround for now and is fast as expected.

Test script:
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$file = $_FILES['file_name'];
$fullPathToFile = '/home/dir/destination';

if(! move_uploaded_file($file[ 'tmp_name' ], $fullPathToFile))
  echo 'Error!';
else
  echo 'Success!';

Expected result:
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The file should be moved relatively quickly. Larger files may take longer.

Actual result:
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Small files take a long time to move.