One thing I was advised in an earlier thread - don't install the extensions you don't use!
For example, I also purchased SuperSuite and I never use eCart, but always had it installed simply because I owned it. The last time I installed it took almost an hour to do using the Adobe extension manager. Solution was to remove it and forget it.
The Adobe EM is a pile of doggy-do and always has been, and the inordinate amount of time it takes to install large extensions is entirely down to them.