Context
When I open the menu settings for the Search view, the dialog tool 30+ seconds to open.
I think it has something to do with menu select, disabling the module speeds it up.
Findings
I used the firefox profiler, and see a lot of attach behaviors from views_add_button and admin_dialog.
Disabling admin_dialog fixed it.
What was happening? Maybe an issue with js library order, or unscoped function, or other conflict.
Done
Seems like an issue with Admin Dialogs module.
I'll live with it for now or remove the module.