I am a Windows user and have the exact same issue. Chrome, Firefox, edge they all do the same. I was actually just complaining about it to my Meraki TSA last week.
I also experienced the issue on my Android phone. I have not confirmed that it's RAM utilization but the phone pretty much locks up till I close the dashboard.
Here's how I reproduce, first of all the dashboard is sluggish, extremely slow and painful. When I select a site with access points, and I want to view the list of access points it can sometimes take minutes to load the list of access points even if there's only three.
When I click on an access point, the page takes 10 to 12 seconds just to load and as soon as it loads it refreshes and you have to wait again.
With the access point page open, it's something going on with the live graphs and objects that connect to the device or show you live connections and utilization. This somehow is what I think is causing the issue.
This occurs on the old version, and the new version of the page, but is more stable in the old version.
Generally when working on issues at a location, I may have to open up that live view page for three different access points at the same time, sometimes four or five. Once you get one or two of them open, my RAM utilization will go from 9 gigs utilized all the way up to 15. It will completely max out.
Thinking that it was a problem with my machine, I tried it from another machine, fresh build of windows on a virtual machine and it has the same issue. When I open the page on my Android phone the browser pretty much froze and locked up, so I'm not sure why some are seeing this and others aren't, but I'm definitely seeing it across all devices I use to access dash.
My personal Meraki account is on shard n17, and my large corporate account is on shard n45. The issue is consistent on both of them. But it seems to be worse on n45.