Thought I would play with this now that it's had a few interations.
First thing I encountered was a 100 tile limit. 
I have many reasonable Dashboards but I always keep one with every device in it as a catch-all emergency view.
I pared it down to 154 from 222 but no bueno.
wow!!!!
Sounds like the Cheeseburger Royale of dashboards. 
Hopefully the limit can be raised for (crazy) people like you. 
I'll bump it up to 200 device, let's see how it goes.
There are some design limits there, but 200 should still give plenty of safety margin.
I was hoping for 203, but I'll accept your decision. 
Ha, thanks!
There are a lot of devices but some are ancilliary like Fibaro 222's which expose up to (9?) devices but I only use one device temp probe.
Aeotec Smart Switch 7 has an LED device as well as the switch and I have several.
Maybe get rid of 3 of the 38 temp sensors you have in a single room?