We played 2 days on a privat server. We build a car and the we drived a while.
At the first 5 - 10 min our FPS are round about 60. After 10 - 20 min, the FPS will drop to 8 - 15.
Tested w/ Sedan and Lada and 3 Player. It's fells like a buffer/memory overflow.

The we searched nettings on the coast. Two Player are walkin and the other player is driving.
Then, or driver come back to us. 50 - 30m bevor the car comes near to us, the FPS dropping 15 - 25.
And the Car sound is creapy. Sometimes it is only sough or the engine is gone.

It was befor the yesterday patch.

https://www.twitch.tv/hajo_tv/v/77672689?t=0h27m03s
https://www.twitch.tv/hajo_tv/v/77672689?t=01h23m03s
https://www.twitch.tv/hajo_tv/v/77672689?t=01h38m54s