It appears that Sony is using the PAL version of PS1 classics in its PS Plus subscription.
The subscription has now launched in Asia, but – as spotted by VGC – some PS1 games are using the PAL (Europe, Australia, New Zealand) version instead of the NTSC (Asia, America).
That means they’re presented in 50Hz instead of 60Hz, resulting in a lower refresh rate and therefore lower framerates.
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