It's been rock-solid & fast since the transfer on the 25th, at any time of day. So yes, I believe they've solved the performance issues.
Now for the usability issues...
2012 Black SV, bought 2012-04-04, sold 2019-05-10. 7 bars, 101,850 miles.
Current rides: 2018 Tesla Model 3 Performance, 2018 Chevrolet Volt LT