Indeed turn tile off...a handy feature I've yet to understand as I couldn't use it in the demo..but it sounds dangerous...LOL...and take AA up by percents till you have a good [acceptable to you] tradeoff tween Quality and Render Speed...

 

Once in a while I look around,
I see a sound
and try to write it down
Sometimes they come out very soft
Tinkling light sound
The Sun comes up again