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Just had the CCS retrofit and decided to test it. First on 50kW DC, then on a 350kW DC and then on a CCS twin post supercharger. Car is a June 2018 built / Sept 2018 delivered Model X 100D. Video describes my experiences. Hope it's useful:
Since 2019.12.1, The 100 kWh Model X and S have been able to charge up to 150 kW. Of course most Superchargers don't go that high. We've seen 143 kW on our cars.