So STK finally went 1.0 and has brought some really solid multiplayer!

The networking implementation has been a very big and ambitious task, which took even longer than the port from PLIB (anyone remember that?) to Irrlicht in 2010, which took around 14 months. But it is done: more than 20,000 lines of network related code and 18 months later, we have reached our goal, and online play is a reality. Across the whole game, more than 2500 commits and 300 resolved issues separate the 1.0 release from 0.9.3.
http://blog.supertuxkart.net/2019/04/supertuxkart-10-release.html

So get fucking playing already!