I had a doctor run into this issue a few weeks ago. In fact, we both have similar laptop models (Dell 7000 2-in-1). His was the higher end i7, mine is the i3...yet my laptop would load the II much faster (his took close to 45sec, while mine was like 12).
Finally discovered the Intel wifi chip to be the cause. The i7 system came with an Intel 7365 AC chip, while the i3 was had a Broadcom chip. I could swap them and the one with the intel chip was always much slower. The affect even carried across different APs.
Funny thing is the Intel chip actually speed tested faster, but it seems accessing lots of small files, as in the II folder, slowed the Intel chip down significantly.
