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Seems pretty poor. Well below the norm for a 2021 Performance. Assuming not some sort of software bug, this original 315-mile vehicle is showing 17.5% loss, to 66.5kWh vs. original 80.6kWh.
This is considerably more than what is normally observed. 15% is high but not uncommon. 8-10% is more typical at this point.
Probably higher than average chance you’ll have a battery failure in the near future, especially if this were a sudden decline. But really hard to know how that correlates if at all.
Do you have a lifetime Wh/mi figure in your odometer panel? Barring that, what's the figure since your last charging session? Additionally, what's your typical charging regime?