Oh yes that was what was making it vary so much, woops . It still has a bit of variance when it gets very laggy but I figure i can cap the jumping height of the jump. Although it probably isn't necessary.

thanks a lot. btw sorry for posting in the wrong forum. didn't realize until now.

Hello, I'm trying to make a platformer game, and I've done the basics, walking and jumping. I use a gravity variable to add to the vertical speed every frame basically. The position is modified by the vertical speed. I multiply vertical speed by dt in order to keep the movement somewhat independent ...