I must not be at a high enough level to be able to tell. The old set I had years ago, I noticed a small speed penalty from the weight, but the new set I just put on this summer seem to ride just fine, at least for me. I haven't noticed any problems cornering on them or anything like that. I am in no way a competitive biker, though, so I'm not counting individual grams. My bike is 15 years old and the only piece of carbon fiber on it is the front fork. (Aluminum frame.) As @
LittleLebowski would say,
#poorfag or whatever.