If you want to learn to speedrun this game and you have a 60hz monitor and you have the steam version switch to the ogversion because some speedrun tricks (pause buffer) aren't on 1.2.5.

right click meatboy in your steam library and go to properties. activate "ogversion" from the beta tab. no code needed.

I also experience some input drops on 1.2.5 but i have heard that other runners have that issue on the ogversion too. But i rarely have drops personally.