Does adding 100Mbps Switch bring down the speed of a 1000Mbps network?

I have a wired Airport Extreme network where a 1000Mbps Ethernet switch in one room adds connections to other peripherals.
Now I want to add a switch in a different room for wired connections that are now operating wirelessly. And I have available a 10/100Mbps Ethernet switch. If I add that to the network do I bring down the speed of the entire thing? I realize that the connections directly from that 2nd switch can only be 100Mbps.
But will I affect the speed of the other connections?
Thanks in advance.

And I have available a 10/100Mbps Ethernet switch. If I add that to the network do I bring down the speed of the entire thing?
No
I realize that the connections directly from that 2nd switch can only be 100Mbps.
Correct

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