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Tesla made my car slower after they repaired it

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if you use the toybox "easter egg" for Ludicrous and get the battery hot enough (~50C), when you Launch properly the left side of the instrument cluster will switch automatically to show power readings. If these are off then you have facts to put to the S/C which are easier to discuss than seat of the pants dyno or GPS acceleration. This may be software version dependent so can't vouch it still works in v11 as haven't tried it recently.

I too had a similar issue ('17 P100D) after having the half shafts changed - my peak power was down from 540KW to 480KW so I absolutely can believe Tesla can change the power in software after driveshaft change) but my problem went away so I didn't have to fight it when I had the MCU2 upgrade - I guess the restriction didnt carry across or they forgot it - made the MCU2 even better value!