I just ran through a few tests with the v14 patch against 100GB of data
from dbt3 and found a 30% improvement; 3.6 hours vs 5.3 hours.  Just to
give a few details, I only loaded data and started a COPY in parallel
for each the data files:

Here's a visual of my disk layout, for those familiar with the database schema:

I have 6 arrays of fourteen 15k rpm drives in a split-bus configuration
attached to a 4-way itanium2 via 6 compaq smartarray pci-x controllers.

Let me know if you have any questions.


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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not

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