You answered your own ? Weight and drag both contribute to the loss of speed...

For the noise issue I assume it is due to the microgrooves in them that make the noise...

I stood off to the side and halfway down range and had a friend shoot the Quikspins,Blazers,and some AAE fletchings....WOW WHAT A DIFFERENCE!!!!
The Blazers hands down are quieter...To heck with a noisy bow those arrows coming thru the air at ya are enough. No wonder deer duck the arrow sometimes...

I am currently shooting the Blazers and since have converted 4 of my buddies....They are awesome and I'd recommend them