9.1 got really fast ;)

I have to share this, a statement that is finished before I even run it ;)

Limit  (cost=0.00..527.34 rows=20 width=4) (actual time=0.046..-2.436 rows=20 loops=1)
   Output: id, (count(*))
   Buffers: shared hit=191
   ->  GroupAggregate  (cost=0.00..12403455.78 rows=470416 width=4) (actual time=0.044..-2.448 rows=20 loops=1)
         Output: id, count(*)
         Buffers: shared hit=191
         ->  Index Scan using idx_pid on prodlink z  (cost=0.00..12373751.62 rows=5000000 width=4) (actual
time=0.021..-2.578rows=183 loops=1) 
               Output: id, pid, bid
               Buffers: shared hit=191

Total runtime: -2.368 ms   <<==== this is amazing ;)

This is with 9.1.1 on a Windows XP machine