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We also used the tag layout to further optimize the resource layout for our DVD build. Tag_references, tag_blocks, and tag_data contain members that are not necessary for our shipping build. As you can see from the declaration of a tag_block, there is a pointer to the tag_block's definition; this pointer is used to map type information to a tag block. Since tags cannot be modified in the shipping build, there is no need to keep this member around. We stripped this data when we built a cache file. For a typical Halo 2 level, this saved ~700k to 1MB.
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