Battlefield 2 - Rebalance Mod - FPS drops when someone is sitting in a tank ... (Battlefield 2)

I play on high settings, with 40 bots on the map, it gives out from 40 to 60 FPS, but when I or the bots get into the tank, FPS drops to 10 - 5. I tried to set the settings lower - one fig, no changes. I noticed that in Project Reality it is exactly the same ... What can you do about it? When the tank is destroyed, the FPS again becomes in the region of 40 - 60.

In the game, without mods, FPS is always in the region of 60. But playing without mods is already tired ...)