I am a user about 6 months into blender. Earlier I was doing my work on an i5 6200U with Intel HD 520, and now I have moved to a i5 7200U with Intel HD 620 graphics.
My cycles viewport rendering (you know, the noisy rendering if you move around the scene with cycles on) was pretty average on the i5 6200u, but now as I have moved to the new one, I am getting much slower viewport renders, although there is nothing to complain about the final image renders.
Viewport renders themselves, even on a simple scene, takes around 50 seconds to completely denoise! I have turned out viewport samples, but it doesn't seem to help.