Guys Great news!!! I GOT IT.. i finally figured out a way to reduce render times. I went from render time 1 frame at about 1 minute, to now 24 to 30 seconds:) at a 720 X size.. All i did is, instead of using the normal atmosphere i did environmental mapping and in effects i loaded one of my pictures JPGs, and it looks quite ok, say if i'm in a forest scene, the image will be a forest. Then , I create a terrain, i create a few trees a few plants( but not as many as in the ecosystem) and There you go. it looked awefully unflickering, and also super high quality, i don't know how i managed to do it, but now it's fast and awesome, even if i don't have all the detail of a full Ecosystem. well, :) Thanks to all who helped. Today i had this goal to arrive at some nice rendering setup, and finally i did.