A comprehensive guide to optimizing Docker builds for multiple architectures (amd64 and arm64) using registry caching. The approach involves a 3-step workflow: building and caching each architecture separately, then combining both caches for the final multiplatform image. This method prevents cache overwriting issues and significantly improves build performance. For frontend projects, the guide recommends building static assets only once on amd64 architecture to avoid unnecessary duplication, then copying them into the multiplatform runtime image.