How to change point cloud coordinates

How can I change the coordinates of a point cloud that is already rendered on the GUI?
This is to essentially to speed up a program. Other atempts in removing and adding a new point cloud for each frame is too slow.

Ive been trying to use PointCloud.Points to access the values. I have no idea how I can change them? This code does not give any errors, but doesnt do anything:

for point in PointCloud.points:
point = [x , y , z]