Update []: Following this update for Persona 3 Reload on the Switch 2 last week, Digital Foundry has now taken a look.
Patch 1.03 fixes the game's 30fps output with an even 33.3ms update - ironing out the 16ms and 50ms spikes and delivering a consistent, properly frame-paced output. Ths issue impacted both docked and handheld modes and it's good to see that both are now fully fixed.
...We also were frustrated by the launch version's lack of a 60fps "performance" mode, which meant it fell short of the steady 60fps frame-rate delivered by the other versions...Atlus has resolved this complaint with a new, optional 60fps toggle, though unfortunately, it's only available in docked mode. In our limited testing, the mode sometimes dips into the upper 50fps range, but otherwise, it's indeed locking to a 60fps frame-rate. This comes at some fidelity costs, however. Lower resolution shadow maps are arguably not very bothersome in standard play, but this mode's apparent culling of ambient occlusion is more dramatic.
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...across the board, whether in portable or docked mode, and whether running at 30fps or 60fps, P3R on Switch 2 still renders at 1080p resolution.
Our last complaint about P3R on Switch 2 is input lag, which is only marginally improved in the game's latest patch... the patched Switch 2 version still suffers from roughly 180ms of input lag in its own 30fps mode, whether docked or undocked. This is tested on a display with 12ms of input lag and using a wireless Pro controller...The only relief in the patched version comes from reduced input lag in its new 60fps performance mode, which drops down to roughly 120-140ms in the same testing environment - but that comes at the cost of noticeable image degradation and is only available in docked mode.
You can get the full rundown in the video above and find out more in the story on Digital Foundry's website.