I want to speedrun with my brother and friend. I can use LAN with my brother but I don't know how to allow my friend to join. all the free server hosting sites take forever to set up and i cannot see any way of doing 3s attempts.

what is the method that top speedrunners use to speedrun together?

I want to use speedminer to auto reset seeds in MC but I don't know if it is allowed and I don't know how to find out and how it works. Is there a tutorial or something?

I use livesplit I want to use a timer that can show up on top of Minecraft fullscreen. Also how do streamers do it, I want to be able to record my gameplay and timer at the same time. Is there anyway to do this? must i get a new timer or is it possible with livesplit?