Hi,
Yesterday I tried for the first time doing an animation with Irr. Map set to animation mode. I needed that because my sun is moving.
Anyway, anything went ok except for the render time : when doing individual frame renderings to test, the rendering time was of 25-30 mn. But for the final animation (interp frame set to 2) the time is of 80 mn per frame ! That’s a huge increase. Is that normal or not ?
If you’re using animation mode for the irradiance map, the interpolation sample subdivs will be multiplied by the number of frames being interpolated over time. This is the reason for the slowdown. Either lower the interpolation sample count, or the frame count in the time interpolation. Or just live with the time increase knowing that your render’s sampling level stays consistent with still frames. 
Bes regards,
A.
Yep ok. I thought that 2 frames was already a low value. I’ll try with only 1 frame interpolation next time.
Thanks