Why the game is buggy when scrolling through disks, etc. (Forza Horizon 3)

On any hardware and in motorspot in the horizon arises the problem that the buggy when scrolling through the disks,machines, etc.In Motorsport when scrolling through the cars lag significantly stronger than at the horizon.Despite the fact that both games are 100+FPS
How can I solve the problem????Of RAM 32GB and top iron to boot.Tried on another computer and the same problem