Swift Publication solves the challenges of performance degradation and high author instance load that occur with the default DX Core publishing, especially for large content repositories. 

The primary benefit is significant improvement in publishing speed for large publications, and offers better scalability for frequent and large publications. It works by storing content versions in an external version store (such as S3). When changes are published asynchronously, they are sent to this external store, from which public instances then retrieve the updates. 

Key features include the utilization of an external version store (e.g., S3), significantly reduced author instance load, high scalability for publication size and frequency, and asynchronous publication processing.