Barelli Roma Ciampino (LIRA) FPS issue

Hello,

I have recently purchased LIRA from Barelli. Unfortunately, to my disappointment FPS are horribly low despite having solid PC(i5 13600kf, 3070ti).

Does anyone else experienced similar issues? What may be the cause? I don’t have such FPS problems in MSFS on different, more complex sceneries (excluding Fly2High EPWA in which case situation is not that bad).