Wait, so are you a non-technical co-founder who had an idea, hasn't written any code, and now is annoyed that the developers who are working for equity aren't moving fast enough?

Before you jump to another set of developers, maybe you should figure out why these developers aren't as interested as you think they should be. Perhaps you need to offer to pay them instead of just paying them with equity, you could then buy back some of the equity you gave up.

I don't feel like we have the entire story here.