My CW Control tab (in 6.1 and 6.2 series at least, not sure about before) uses a massive amount of memory, tested in Chrome, FF and Edge. It looks like the JS heap is fairly stable @ 10 - 20MB, but DOM nodes and event listeners balloon massively over time - about 10 minutes in, I see 70k or so of each and they just keep growing.
I have a JSON Chrome debugger timeline dump - don't see how to attach it here, but e-mail me if you'd like it.
About 1,500 access hosts total, running on Server 2012 R2 with SQL backend.
Customer support service by UserEcho