Debugging performance issues

If you're encountering performance problems, here's a checklist:

• Are you building with --release? (Don't laugh!) Development profile builds trade overhead for diagnostic ability:

  • InstanceFlags::DEBUG is set by default in development builds, which enables platform-level validation, like the Vulkan validation layers.

  • The Rust compiler doesn't optimize the generated machine code.

  • Development builds have more assertions enabled.

Please add more checklist items, based on your experience.