I'm rendering 10 frames of a scene both on a Dell XPS 15 Notebook and my Desktop PC.
Desktop: i5-2500K + GTX 1070 8GB
Notebook: i7-8750H + GTX 1050-Ti mobile
CPU (i5-2500K): 2:34 min
GPU (GTX 1070): 0:37 min
CPU (i7-8750H): 1:24 min
GPU (GTX 1050-Ti): 0:51 min
Though as expected the 1070 is faster, I would expect a much bigger difference, as the 1070 shows around 3x the performance of the 1050-Ti Mobile in various benchmarks.
Is it possible, that the slower CPU in the PC bottlenecks the render speed, although it's not enabled as a CUDA device?