Started PCG in 5.2 and facing many problems and one of them is that this happens when generated content through PCG(But a great update tho!)

[SAM13900]

I guess you got the problem right. The trees have some weird kind of motion blur in their texture. and without PCG, the asset looks normal as downloaded from megascans, and the Framerate is 15FPS which is being displayed in red as it is too much to handle!