@rabidworm333 Please go to the Edit > Project Settings > General Settings > Blueprints > Maximum Loop Iteration Count and change that to a higher number, e.g. by adding one ‘0’ at the end.
For FPS drop, please make sure that you have Billboard Manager placed in your scene. Do your trees turn into billboards when they’re far away, after starting Play in Standalone Window? If so, you can try to change billboard distance in the Billboard Manager. Does it happen also in the included ForestDemo map?