...why would emulators "mostly have lag problems"? Anyway, Flash is going down soon so the community will need to switch at some point (perhaps Flashpoint)?

Regardless, Newgrounds isn't the only site where Riddle School 2 is hosted; the game still functions as normal on other sites.

true but those other sights will stop supporting flash a of December 2020 meaning they will ether

A. shut down B. use there own flash running software (likely with no code altered) or C. just use the download version of the game