Discovering High Conversion, Quick Result Affiliate Programs

I've developed a new mobile app and am looking to increase user acquisition through the best CPA (Cost Per Action) and CPI (Cost Per Install) networks. I'm targeting high conversion rates in the US and Canada and am interested in networks that can deliver quick results. I would appreciate any recommendations for such networks and any advice on what to focus on during this process. Short and to-the-point insights would be greatly