Well, in the same way that my slow work sped up a lot in the first month I was doing it, I hope my fast work does to. There is certainly room to improve. On a rainy morning I went down to Bear Creek and the bike path to do a tempo run. I FINISHED IT! Bursa was alright. It was slow; 24 minutes for exactly 4 miles. But soon afterward I felt fine. Like some part of my body isn't ready to go faster yet but the rest is.
Its good to note that despite working 21 hours at the retirement home the last three days, I didn't feel any lingering exhaustion from that.