anon from >>338409243

Any blender pro here?
I found this video to make anime hair
https://www.youtube.com/watch?v=BqWYgrXw7Jk
But it's using a hell lot of polygons.
How do i reduce the polygons count?
I set the 3D shape preview resolution to 2, and it reduce them quite a lot, but when i try to further lower it with Decimate, the polygons become smooth/round instead. 
How do i reduce the polygon counts while make them sharp and blocky?