Opacity dragging down speed

[mattjgerard]

I have a small part (wheel hub) that I have a white paint on and adding a opacity map to a label to add some grunge. With region render on, without the opacity map turned on, the FPS is at about 300, when I turn the opacity map on, it drops to 13fps. I have always had trouble with opacity maps dragging down the speed by A LOT. I routinely used an expanded mesh opacity map for doing the hard guard around industrial machines, and I had to switch to something esle, as the opacity maps would cause the fps to slow down to below 1fps and this is with 62/64 cores running, standard product lighting settings. I can do a simple test of a cube with a simple material on there, and as soon as I add any opacity maps anywhere it slows way down.

Anyone see this?

[Eugen Fetsch]

Same here! Sometimes it is faster to render twice in layers and create the opacitiy in post.