WaitTimer(60) quick question

The technique below produces lovely results when my monitor refresh rate is set to 60Hz (the same as the code below), but if I change the monitor to say 75Hz, things become really jerky. Is this because the code is out of SYNC with the user's monitor refresh rate ? Is there a way around this without using delta-time ?

frameTimer=CreateTimer(60)

While Not KeyHit(1)

WaitTimer(frameTimer)
update_game()
draw_game()

Wend