I use smart game booster 5 to play airport city,i use it on all my games it works, it speeds up pc
Smart Game Booster enables higher FPS by unlocking full potential of CPU&GPU to achieve smoother animations with less tearing and lower system latency. Gaming experience will be greatly enhanced with a simple click on the “boost” button. You could also modify overclocking by ticking options whichever needs a boost in setting.
https://www.pcgameboost.com/index.php
FPS booster made for smoother gaming
Smart Game Booster enables higher FPS by unlocking full potential of CPU&GPU to achieve smoother animations with less tearing and lower system latency. Gaming experience will be greatly enhanced with a simple click on the “boost” button. You could also modify overclocking by ticking options whichever needs a boost in setting.
https://www.pcgameboost.com/index.php