Low FPS with foliage

I am a self taught game dev and I am trying to make a cinematic with video sequencer. My environment looks good and it is full of assets from megascans. After placing foliage and grass my FPS dropped below 20 FPS. I disabled wind interactions for most of my trees but I still have this issue. Do you think this is related on how megascans are optimazed? Maybe my ram is not enough for ue5, I have a rtx 4060 laptop with Ryzen 7 and 16 GB of ram. I'll upgrade to 32 as soon as possible. But I don't understand why this is happening. There are tons of yt tutorials that place megascans randomly without saying anything about performance and FPS dropping. Maybe unreal is not good enough for cinematics. Should I use blender for it?