Firmware V4.x is making changes. Nginx memory leak was fixed in Beta V 4.1.0 Release 4 and release 5 is out now.

I do agree that Flint does like to use alot of memory, but it also does cache and reserve almost 20%
Running firmware V4.1.0 release 5

You might try using a different blocklist OISD Full list really all you need for the majority of situations. If you are running multiple list with redundant entries this can slow down you DNS

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