The Dark Side of Gaming is reporting that the pirated version of Final Fantasy XV has shows some significant performance differences from the version you would purchase via Steam. A lot of this looks at load times for the game and maps contained within, however performance using a spinning data drive while actually gaming, looks to be hampered as well. Yea DRM? The video of the testing is below, however not terribly exciting. Thanks @cageymaru.
In conclusion, the pirated version of Final Fantasy XV runs better than the Steam version. We don’t know whether this is due to the Denuvo anti-tamper tech or due to optimization issues that can be resolved via a future patch. The point is that the pirated version has significantly less stuttering, loads way faster, and runs better/faster as it is not plagued by the unoptimized scenes that we’ve witnessed in the Steam version!
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Source: [H]ardOCP – Pirated Final Fantasy XV Runs Better Than Purchased