I have added an FPS option in the main landing page,
This will allow you to "cap" the game speed to 60x, if your pc is struggling to run the game at full speed I would reccomend this.
Alternatively, if your Monitor is a 60Hz monitor and you want to run the game at the full 144FPS intended, then you can select the 144 FPS option, however your GPU may still FPS lock you if you do not turn off VSync on your graphical card options.
Please note that the Game speed is tied to FPS, even if you buy up to 143x speed but run a 60Hz monitor you will only get 60x speed.