Postgresql configuration:
effective_cache_size = 35000 shared_buffers = 5000 random_page_cost = 2 cpu_index_tuple_cost = 0.0005 sort_mem = 10240
Lower sort mem to say 2000-3000, up shared buffers to 10K and up effective cache size to around 65K. That should make it behave bit better.
I guess tuning sort mem alone would give you performance you are expecting.. Tune them one by one.
HTH
Shridhar
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