legion

Optimized for fast iteration with Rayon-based parallel execution, allowing systems to run concurrently while maintaining order, as shown in the automated scheduling features.

Offers flexible queries with filters for component inclusion, exclusion, and change detection, reducing boilerplate in entity access, as demonstrated in the query examples with boolean expressions.

Provides intuitive methods like push and extend for entity creation, and a system macro for defining work units, making ECS setup straightforward with less repetitive code.

Configurable for WebAssembly targets by disabling default parallelism, enabling cross-platform development with specific feature flags like wasm-bindgen, as detailed in the WASM section.