After using cisco.com and related tools for half a day - there is a very noticeable speed difference. It is so much snappier. I have disabled both "Performance" and "Tagetting" cookies. It's like Cisco.com just got upgraded.
Then I noticed the same options are available for community.meraki.com (do you see that "cookies" link in the bottom left?), so I am now using the same options to see how it goes.
My gut feeling is that the community website also seems to speed up.
I just did a quick benchmark using Chrome developer tools, Lighthouse, and incognito mode. With those two cookie categories disabled, the "Speed Index" on the home page's load time improved immediately by 7%.