My experience is pretty much the same. iPhone 6s, latest OS. Takes forever (20-30 sec) going to garage when sorted by Eligible for Turf during SC only, problems with tuning as well. I have noticed that within 15 seconds of turf day ending, all the problems disappear, loading goes back to normal times and game runs smooth.
I remember reading a post from one of the dev's, not sure if Rryst or whomever, saying it was definitely gonna happen, just not soon, maybe a year or so. Also said everything would be completely new, meaning you will start from scratch, all cars, money and gems won't transfer over. Said something to the affect of "treat…
Apparently no one is noticing the fact that he said two different A class cars were at 1668. Both of those cars max at 1666. So they were definitely glitched cars. Unfortunately, there's not much you can do about it.