Went on a quick run tonight around the neighborhood in a different loop that I haven't done in a long while. It's basically down a hill and then back up a hill.
My breathing got a little yucky, but never so bad that I felt like it slowed me down. For a 9:58ish mile (1.25 miles in 12:28), it's definitely slower than I'd like to be doing, but honestly? I don't care as long as I feel good on a run. It's been a while.