Does frequent DC fast charging really degrade LFP faster?

My 2022 Model 3 RWD with LFP pack just hit 45k miles, and I've supercharged maybe 80% of the time. The battery health app is showing 12% degradation already. That seems high for LFP. I know these cells handle cycle life well, but I'm wondering if the thermal stress from fast charging is worse than I assumed, especially in winter. I've also noticed that below 50% SOC, the charge curve really tanks in cold weather, which suggests the BMS is being overly cautious. Anyone else tracking similar wear on their LFP packs? Wond