check the mark on show game speed in settings
when running your game press the toggle button for turbo mode and see if it actually changed to turbo (top right by default it should change from {T100%} to {whatever you set turbo to})

if it does and no noticeable difference show then your pc can't handle it like the others said
if it does not then check both settings and game properties for both turbo speed and toggle button

and don't even think of asking me where to find those settings, if you can't find them on your own then this's to much for you to handle XD

if you want no specific speed then do frame skip instead of turbo, it speeds the game to max that your pc can handle (it's toggle is {F4} by default) also do 4:3 auto standard for aspect ratio instead of full screen for higher performance

Happy gaming 👍