I think year and model are important details.
My 2014 Model S P85 I have owned since 65k is at 97k now so I am close but not over 100k.
Far as I know the pack is original service folks have been pretty forthcoming with past repairs.
At 65k it had degraded from 265 to 257
At 97k it is down to 242miles
That was sudden last year.
Only supercharge a few times a year.
Cold weather supercharging last fall was tragically slow even hours into travel don't think I saw over 250mph.
A few days ago and a bunch of updates later I went to the supercharger on a hot day and 5% remaining, spiked to 128kw immediately fell to 120kw and then ramped steadily down immediately, probably only 20seconds at 120kw. Projected 55minutes to go from 5-90% which is I think what it was when I bought it or at least close.