Emulator

I first tested on rev 3867 and so far all of them have this issue that after the
begging of the game where there is good speed, 60 fps, the game have a big slowdown
in the woods after the gate where the that starts.

ok, so you're just complaining your game goes slow...

I forgot to say that i was getting better results on the previous rev, but not good
speeds around 30 fps, but on the latest revs i'm only getting 16-18fps.

the slowdown occurs because the more you reveal in the forest area, the more
polygons and data dolphin needs to process.

It's like in hyrule field, at start you get perfect fps because you start with only
1 area revealed, but once you reveal all, dolphin will just try to process the
vertex and graphic data of all the areas.

I think the reason is because Dolphin does not support any Space partitioning
algorithms to distinguish between what should be processed and what shouldn't be.

Solution: wait until the Open GL plugin be optimized, they are currently working out
compatibility.

here's a link so you read about BSP:
http://en.wikipedia.org/wiki/Binary_space_partitioning