Need to fix lag

I play on iPhone 4s and I dont know if it isnt laggy in other devices but when I click on buildings it takes a few seconds to actually get to the screen to chose to walk or get a bus, and when I went to the grocery store I got stuck at the entrance and couldnt move or leave the building so I had to restart, other then that I love the game

Funketown about Punch Club, v1.11