The experience tends to differ based on whether you go with AdMob or Chartboost. I'm using both providers in various apps...
AdMob loads almost immediately so is not an issue. However, Chartboost tends to be a lot slower. At times 4+ seconds (although on average I'd say about 2-3 seconds). The problem with this is that during these loading times, the application hangs, it does not carry on. This often makes it look like the application has simply crashed (not good)...
It has been requested several times (by me also), if it would be possible to 'Cache/Pre-Load' the advert so that we can display it immediately whenever we like. This is how it works when using the SDK directly, so its a case of AppGameKit (Paul) adding this feature...
Due to the slowness of Chartboost, I am actually considering reverting all my apps back to AdMob (still pondering on the idea
).
Using AppGameKit V2 Tier 1