First of all, hello, new to the forums.
Hoping it would be on a positive note but unfortunately it isnt.
Since last update ( 1.25.3 ? ) it seems that i am driving cars which are fully upgraded but have the performance of a stock car. Its really irritating since i cannot even drive my fast laptimes or set records. I tried uninstalling the game and reinstalling it fresh and login again to see if that would fix the issue but it didnt. I tried other cars to see if the issue occurs with all cars and it has the issue with all cars on all tracks in any kind of game setup. I also fiddled with setting everything back to stock and back to fully upgraded. I tried rebooting my phone etc etc. I troubleshooted a few hours to see if i can get it back to normal, even tried another phone but same problem. I am sure its the game itself. So this is my experience with the new update hoping anyone else has the same glitch/bug
and that it gets fixed with the next update.
Sorry for the long explanation and thx for reading.
M