Howard Miller

The obvious candidate is dire NFS performance.

You say you have Redis running. Are you *sure* you have configured it properly in Moodle admin?

Yes - but this brings us back to shared hosting where the user may not have the option to have the root of the Moodle code outside of the document root. Of course, it's less important for those sites. This is actually progress for the bigger "enterprise" sites for whom it's not a problem to set it up "properly"

I think he's saying (sorry if I'm picking you up wrongly, Petr) that if your code hasn't been through HQ's checks and balances then you're not trusted. That means nearly all optional plugins. I don't find this surprising... not all developers are motivated to take that sort of time. It's even worse if those plugins then include other libraries from unverified sources.

I am not a security expert.

Personally... I'd strongly recommend not doing that. Grading Assignments moves through various states and it's much better to create a new activity for each Assignment. I'm not saying that what you're attempting isn't possible, it just goes against how (as far as I can tell) Assignment was designed to be used.

Sorry - I have no idea what you mean. Especially "12.50 for 8 grades = 100 ". Can you explain in more detail / example / screenshot of your Gradebook settings?