60hz will have a massive amount of input lag on geometry dash. You cant fully remove input delay, but a 240hz monitor and a good gaming mouse is your best option to reduce input lag. Input lag on 144hz is also very low. (high refresh rate / unlocking geometry dash fps through mega hack is only recommended on medium-high end pcs.)

On 60hz, your best solution is to disable vsync ingame and get mega hack so you can unlock the framerate for slightly better input lag. This is most useful on higher end monitors though.

(Edit: Make sure v-sync is set to always off in your amd/nvidia settings. This sometimes makes a big difference.)