Implement lazy loading patterns and strategic code-splitting in file-based routing systems to improve performance and reduce unnecessary processing. Root routes should never be code-split since they’re always needed, while other routes can benefit from lazy instantiation to avoid parsing route trees when not required.

Key strategies:

Use lazy instantiation for route parsing to defer expensive operations until actually needed
Exclude root routes from code-splitting since they’re always required
Add clear comments explaining routing optimization decisions for future maintainers

Example implementation:

// Use lazy instantiation pattern for route parsing
export type CodeRoutesByPath<TRouteTree extends AnyRoute> =
  ParseRoute<TRouteTree> extends infer TRoutes extends AnyRoute
  
// Skip code-splitting for root routes with explanatory comment
if (createRouteFn !== 'createFileRoute') {
  // Exit early for root routes since they are never code-split
  // Root routes are always needed and should remain in the main bundle
  return
}

This approach aligns with Next.js principles of file-based routing optimization and incremental static regeneration by ensuring only necessary code is loaded when needed while maintaining fast initial page loads.

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