I've just bought a brand new iMac 5k and LIghtroom CC and the fan starts to blow at full speed during rendering the previews.
That happens after 50+ images (Sony Rx100, RAW, 20MP) during the rendering of the previews.
Is that normal? I called apple support and they said it is an Adobe LR Problem because during the process teh activity monitor shows that LR has 500+% usage while the CPU and RAM usage is somewhere around 10%.
I installed smcFan and the Temp raises to ~50°C and the fan rpm to 2200.
The weird thing is that if I export like 300images in full resolution as JPGs the Temp raises to 60°C but the fan speed stays between 1200 and 1300rpm.
It's the same if I activate or deactivate graphic acceleration.
Btw... If I export like 2000 images in Full JPG from Aperture the temp doesn't rise even 1C°!
See my setup below. Any help is really appreciated!