May I share some experiences with ya'll. 
I have an app
- aia is 2.81 Mb in size
- assests are
1,196 html files ( this is not a mistake, it is over 1000 html files in Media)
The aia
- will not load in the main server
- it loads in in live development with Companion, slowly but ok in the code.appinventor server
- it compiles the apk slowly. As I recall, it takes several minutes
I have a DSL internet connection of 56 Mbps (see https://fast.com/)