Haven't heard of such issue before. What is your server specs (upload/download rate)? Also check upload and download speed setting in rF2 dedi.
Does it have CPU and RAM enough to manage 37 cars? Did racers suffer this lag when they where racing or you mean it only happens in replay? byyyyyyyyyye
When we racing, the game is very good, no lag, no high ping. The lag is in the replay only. In local, and server replay too
That's not enough for 37 drivers. You need to a min of 256 kbs per client! 256 x 37 = 9472 kbs upload speed. And you need more than that if you have enable Vmod download and skin sharing. With 5000kbs limit your grids to 20-25 clients. Above that you could encounter lag issues.