Interested to see this dialog about possible "throttling" because I have observed what I thought might be throttled (reduced rate) charging at my nearby Superchargers in Dedham, MA. Right off I have to admit that I am one of those "locals" who uses the Supercharger -- in my case, because I live in a condo and have not, until now, been able to install home charging. (Much more about that in other threads. And it will shortly be resolved, so please no comments about how this is wrong, etc.)
Three times lately, most recently today, I have used the Dedham S/C to find that the charge rate dropped considerably once I got to some moderate level of charge. E.g., on July 7 I started with a charge rate of 75 KW (even though I was the second car at a charger), after which it rose to 100KW when the other car left. But at about 40% charge, the rate dropped to 22KW where it stayed until I quit at 63%. So it took an hour to get only 49% charge gain on my 70D. (I had started at 14%.) Today, the charge started normally at 98 KW or so, but dropped to 22 KW at 34%. It took 45 minutes to gain only 35%. (I do not watch constantly so the rate change could have occurred sooner in both cases.). In the past 3 weeks or so I have also used the Sagamore and Seabrook S/C stations, and have not observed the same behavior. Charging has been much faster for the same total gain in range at the Sagamore and Seabrook stations.
At Dedham, I have not paid attention to which specific pedestal I am connected to, so I do not know if one or two of them at Dedham is having a technical problem. That did not occur to me until I read this thread today.
Weather was not an issue. Temperatures were in the 70s both times I noted the reduced rates.
So, absent a technical issue at Dedham, I do suspect that I am getting reduced charging rates at the Dedham S/C. The effect is that I either spend more time there, or have to come back sooner.
I also have not received any letter or other communication from Tesla telling me not to charge at a local supercharger, as some folks apparently did last summer (before I had my car).
So I will try to pay attention to which charger(s) are giving me reduced charge rates and inquire of Tesla if it looks as if there is a technical problem with any one of them.
With any luck, I will not have to use the Dedham S/C as my primary source once my home charger is installed in couple of weeks. (I am waiting for delivery of a Tesla wall charger.)
