It's definitely faster for me with the correct dropouts: pull to release, push to tighten again compared to loosen two bolts... tignten two bolts How is tensioning any slower with a qr? you put the wheel in place and clamp it shut as compared to putting the wheel in place and holding it there until you get the drive side bolt tightened.

Either way its not really a big difference outside of race situations. I really just did it because my wrench kept falling out of my bag and this way I can just leave the wrench at home.