Performance

For end users, the main performance recommendations are:

1. Prefer mul! over * to avoid allocations.
2. Preallocate with allocate_in_domain(op) / allocate_in_codomain(op).
3. Use operator constructors with array inputs to preserve storage type (CPU vs GPU).

Developer-oriented performance internals (threading heuristics, storage traits, backend caveats) were moved to Custom Operators to keep this page concise.