Abstract: Optimization architecture for applications that uses a localization model in which localizable resources are separated from code. The resources are typically located in separate DLL files as binary blobs in a unique format. The format is designed for optimized performance and to accommodate various requirements of complex office applications. The binary blobs are produced by a resource compiler based on the format. The architecture includes a resource binary format that facilitates resource identification and lookup, optimization of memory paging by grouping and ordering resources according to runtime use, optimization by compressing resources with an optimal algorithm that is fast in decompression, fast reverse lookup of a resource identifier by resource content, resource grouping, resource substitution, branding, and resource runtime metadata (also referred to as user data).