Hi thanks for replying.
No I have no issues with anything else, no lag on busy sims, my pc is perfectly quiet. It is also a new PC, 3 months old. Ironically my old PC never had this problem.
Its just frustrating that my PC becomes noisy at the sight of big alpha trees, I wanted to use a tree at my home, but soon as I rez it, the fans go to max.
I know it's the alpha, because if I turn off alpha in the render settings it stops, but of course I see no leaves then.
What causes that to happen, and is there any setting I can try?