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please changing your php configuration for:
max_execution_time from 30 to 3000
max_input_time from 60 to 300
max_input_vars from 1000 to 5000
memory_limit from 526 to 1024
we need to try this because your site having huge stream data.
I have posted a videolink in the first post so that you can see what my experience is. I have tested with regular user and other admin account and i had the same experience. Michal also knows more about this issue so please contact him for details.