Map Loading Bug

If I am logged into my main account, which is gold, I can also log into a second account that is silver and play MM solo on that silver account. However, the majority of the time it takes a few minutes for the progress bar on the map loading screen to even begin moving. In this case I always pop into the game halfway through. This does not happen when I play on my gold account, but shouldn’t be happening ever. Seems like a networking issue.