Seamless looping timeline?

I have a timeline that starts with a character at a position and ends with the character at that same position. However, what I noticed is the character automatically slows down near the end of the timeline track until it comes to a complete stop at the end. Then the timeline wraps, and the character starts moving again.

Is there a way to stop a character from slowing to a stop at the end of a timeline, and instead loop seamlessly?

 

Adjust the curves of the animation.
The normal interpolation is a spline curve that smoothes out towards the start and end.
All timeline animations are just normal animations, so rightclick and select "edit in animation window".
Then - as usual - click "curves" at the bottom and then adjust the curve settings so its doing a linear interpolation.

 

I'm guessing it's one of the Position curves? I see three of them and I'm unable to get a continuous flow after modifying them.

 

A position vector consists of 3 individual values, so you have to modify the curve for each one of them (X,Y,Z).

Maybe there is a better way to do this, but I'm not aware of one. It would be cool though to get a consistent position movement.
Maybe someone else knows how to do it

 

I got it to loop seamlessly

Right click the beginning and end keyframes and choose Both Sides: Linear
This changes the interpolation to be smooth instead of gradual.