I've experienced the same in F2 yesterday. Major lag after T1. It seems to be an issue after some cars came in contact with each other.
A detailed description of the issue: Major lag spikes after the race starts, either when cars are offroad or come in contact with each other
What version of the game you are using: 1.14
Ranked/Unranked/Leagues: Unranked Multiplayer F2 2020
Wired or Wireless Connection? Wired Chromecast Ultra, Controller on 5GHz Wifi
The amount of players in your session? 15 Players
Were you the host? No