Debug vs. Release performance

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Partially true. In debug mode, the compiler emits debug symbols for all variables and compiles the code as is. In release mode, some optimizations are included:

  • unused variables do not get compiled at all
  • some loop variables are taken out of the loop by the compiler if they are proven to be invariants
  • code written under #debug directive is not included, etc.

The rest is up to the JIT.

Full list of optimizations here courtesy of Eric Lippert.

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