> Would it really be so hard to have a low-priority thread loading the 
next level into a second block of RAM during the current level, or even 
during the elevator ride?

In a word, yes. It's only (relatively) easy under the assumption that a 
level can be "loaded into a block of RAM," which is probably not the 
case. There are probably many different things in a level that are 
loaded into many different places that interact with many different 
systems, all of which would need to be updated to make that possible. 
This comes with new bugs that take time to track down and fix. 
Obviously, some games do manage to do this, but that doesn't mean it's 
an easy feature to add to an engine that doesn't support it.

  - Slime

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