Always freezing is new. Are there any exceptions in the developer console when it happens?
(Command+Option+I on MacOS I think.)
If there are no exceptions, does it stay frozen for longer than 5 minutes if you leave it?
Shaders are often a pain to work properly on every device. Right now I'm not sure if they completely break for your case or if they are just loading very slowly.
EDIT: I've installed Brave (kept all default settings) on Windows and do not freeze for more than couple seconds at most and only the first time. Not sure if it is due to some specific customized settings on your Brave, or due to something else.