Hi,
I have a similar issue - I can:
Add 30-35 layers to a Web map and save it.
Use this web map in the AGOL interface from Edge/IE, no problem.
, but when viewed/used in Chrome (Version 52.0.2743.116 m) the result is a very high CPU usage and freeze/crash of Chrome.
The freeze/crash happen almost immediately on a big screen (24 inch+) while a bit of abuse by a lot of quick navigation trigger it on smaller screens as well. It don’t happen in IE/Edge etc.
There are 30-35 layers added to the web map.
Thanks!