As far as the changes, I've got those documented here.
Can't really say if there's something up with your car, and not sure what model you have. For us, just 2 data points for you. My 2018 LR AWD does 0-60 in 4.28 sec on the dragy, and my wife's 2020 SR+ is 5.19 sec, documented here. Both exceed what the Tesla.com pages said when we placed each of the orders, car details in my signature below.
Have you noticed any difference in the rubber door seals? I took a look at a 2020 in the show room and the material was thicker and more rigid. Wondering if it helps with noise, and if Tesla will allow me to pay for a retrofit?