I've setup Crowdrender just today and it's pretty cool! My main PC, a gaming laptop is running as loud and hot as ever, task manager agrees that it working really hard when rendering, like normal. But, both of my nodes (older gaming laptops) are running cool and quiet, task manager showing both of them with a CPU load of 20% when rendering, close to zero when not. TM also shows the Nvidia cards near zero when rendering, too. I have both set to CUDA (which seems to help speed greatly VS. CPU), but, I can tell the two nodes aren't working hard at all. They're cold and quiet. Any suggestions?
(Win 10, Blender 2.8, all three laptops are I7s from 3rd gen to 7th. All have Nvidia cards.)