immersive vehicules lag

Hello,

We're running for the first time immersive vehicules on our server and we got some serious lag problem. We're using the default pack. When we start driving a car or a plane, the vehicule lags so much but the other players on different chunks aren't affected. However we do get a drop in the server tps from 20 to about 13 only when we're driving a vehicule, especially planes.

My question is : is the lag a server problem with aternos or is it client-side ? Server's tps is affected tho so I have doubts.

Yeah I expected that. So for the FPS i guess it's our internet not being the best. But tps i guess is the biggest problem : if the mod was added to aternos, it shouldn't be normal to have a lower tps when using it, I don't see any post regarding somenone who's been having this issue with immersive vehicules, so what could be the problem here ?