both machines are light on vram which could explain the performance issue you are seeing.
The 2nd machine is running intel iris graphics which are not great for open gl programs like rhino.
the 1st machine only has 2gb vram on the radeon… again… a little light as we’d like to see 4gb.
see this thread- If you are buying a new laptop READ THIS
for macs, the choices are very limited, but in order to run well, you should buy the biggest graphics card they offer in each machine. RUN AWAY from intel integrated graphics machines.