Hello, and sorry for the late reply!
The subsequent opening will always, always take less time, and that’s normal. Once the level is opened, some data are kept in memory, permitting faster opening later on.
As I said, different computer means different speeds. If you want your level to open as quickly as on your friend’s, then get the same computer as him x).
If 20 minutes is the time it takes to fully load your level on your computer, it is what it is.
Again, divide your level in sublevel and, hide those you don’t need while working. This way, opening your level will be quicker as your computer won’t have to load everything at launch. You don’t need to see your art assets in the engine while working on character controls ;). And if you sublevels are in “Always loaded”, you will see everything in-game when you’ll press play.
Really, a good workflow is the only thing that will make your loadings faster.
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