>    Buffers: shared hit=544 read=6760 dirtied=4034
>    I/O Timings: read=69709.611
You has very slow (or busy) disks, not postgresql issue. Reading 6760 * 8KB in 
70 seconds is very bad result.

For better performance you need better disks, at least raid10 (not raid5). Much 
more memory in shared_buffers can help with read performance and so reduce disk 
utilization, but write operations still will be slow.


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