Now, I'm going to make an educated guess, but if the SQL query to select 'My Postings' is what I think it is, it takes time to sift through the entire DB for any post that has been started by yourself and that you have contributed to. Think about it.
However, it's incredibly likely to be something else considering the sheer length of time it is taking, but perhaps what I describe above, with another problem PCA know about, accounts for the dragging out in output time. Who knows apart from those who need to know. :-)
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