The aim is to get from the start of the map to the end as fast as possible. These timeruns are recorded to the website where you can compare them to other players as long as you have registered a timeruns token. Here's an example of a timerun:

Another video is available here.

Simply follow these steps:

• Login to your account or create one if you haven't already
• Open the account page
• Copy your timeruns token
• Add the following line to your config file (e.g. autoexec.cfg):
  set etr_authToken "PASTE YOUR TIMERUNS TOKEN HERE"
• Open your game, connect to a timeruns server and execute your config
• Login by using /login
• Note: you can use etr_autoLogin 1 to login automatically
• Play! :)