Hey! I know this program isn't about speed (despite the name) but some people still care about their speed and wanting to get faster.
I graduated C25k in February and my first thought was to work on my speed. However when I pushed myself I got injuries which actually prevented me from running for a few weeks! Nightmare!
So I concentrated on just running because I enjoy it and having the motto "slow and steady" in my mind to remind myself that just doing the run was more important than speed.
I have slowly increased my runs from 5k to 7k on a weekend and last weekend managed 8k! (That includes the two five min walks).
Anyways, I use Mapmyfitness when I run as I like it to tell me each 1k I pass. If I'm aiming for 6k I know at 3k to turn around.
It also tells me my pace-per-km. I didn't pay much attention? Some days I run better than others but it also depends on the route I take. But just recently I started noticing an improvement in time. I thought maybe because I haven't been doing my old route with hills but today I did that route and my time was still better than it used to be! I now run about a minute per km faster than I used to! And in a natural way (body getting stronger, more efficient) rather than trying to force it.
Anyways I remember when I used to be here more often people asking about speed so I thought I would come share that it WILL come. On its own. Just enjoy your runs!