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We've come a long way already but unfortunately we're still only at 100pps per threads (playouts per second) on 19x19. Judging from the numbers other people get at least 10x faster is what we should aim for.
There are many things to try, but most boil down to doing less work. It seems to be especially important to do less counting of liberties. See for example this thread on the computer go mailing list.
Version 0.3.1 has the following performance characteristics: