Provide explanation on script load performance overhead

[Norbert Csaba Herczeg]

• SystemJS Version:
• Which library are you using?
  • system.js
  • s.js
  • system-node.cjs
• Which extras are you using?
  • AMD extra
  • Named Exports
  • Named Register
  • Transform
  • Use Default
  • Global
  • Dynamic Import Maps
• Are you using any custom hooks?

Question

The official documentation refers to a 1.5x performance overhead for loading scripts when using systemjs. Can anyone please provide some info on where does this overhead come from? E.g.: if I'm only using system bundles, then there should be no special AST magic applied right?

I'd suggest putting this explanation to the docs as well.

Thank you!