I copied the built-in Fps class in OpenFL and asked AI, but AI said that the built-in Fps class in OpenFL is not accurate?

It is a known issue:

If I follow those threads correctly, migrating to SDL3 is a possible solution, if that’s the direction they choose. Version 3 was only officially released in January and I expect moving to it is no trivial task. There’s some discussion about that here.

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