[kilishan]

Few years back the common way was to filter through all that and save cleaned values to DB. That does have a drawback that if someone manages to find a way around filters, all old data would need to be checked again, something you as developer, might not even be aware of - giving you false sense of security.

Somewhat answer my question.
I get it. But I havent seen live example.

I fork CI4 - View to accept min.html as template view (as in CI3), and wonders if i can skip some checks to eek out performance

Don't skimp where security is concerned. And don't worry about performance that much. CI is pretty darned fast. If you have a view that is slow - cache that view and call it done.