MoPub - App freezes (30+ secs) while loading ad


I’m experiencing this issue with MoPub since I implemented them. Whenever I want to launch the first MoPub ad the app simply freezes for an extremely long time, like more than 30 seconds before displaying the ad.

It seems I’m not the only one, but no one has an answer on the subject.
Android & MoPub - App freeze on startup - Stack Overflow
iOS & Mopub: app freezes when loading ad on a slow network - Stack Overflow

Anyone experienced this and is there any way to solve it?

Any help would be appreciated.

Their servers are not as fast as they should be for a mediation platform. Have you tried admob mediation. Google servers are very fast.

I wish moPub has a non-hosted open source version.