I am refinishing my basement. I have a HW hydronic zone for my first floor on a monoflow loop around the perimeter of the house. It is low hanging and obtrusive. I will to better conceal it. I can 90 degree it up into the rafters on two sides of the house and 90 back down when going perpendicular to the rafters when I can box them in later with some drywall.

Does all these extra 90s restrict the flow of the system?