Yes, devices connected to the 1000 mbps switch will communicate with each other at the 1000 mbps speed. However, their link to the router (and presumably the wifi, if the router is handling that as well) will be limited to 100 mbps.
That’s what I’m hoping, but, I have a contradiction posted too, just above this post.
https://freerepublic.com/focus/chat/4346770/posts?page=4#4
It looks like you are in the majority. ;-)
Thanks!
(Finally I asked a resolvable question!!!)