The remapper is part of the Unity PersistentManager that tracks object references across scenes and bundles. In Addressables, its size scales with the total number of entries in your addressables catalog and the metadata fragmentation of your AssetBundles. To optimize this, you must reduce the granular tracking of assets.

1. Consolidate small Addressable Groups into fewer, larger bundles to reduce the total count of AssetBundles generated, as each bundle header adds to the remapper overhead.
2. Address folders or your collections rather than individual files to significantly decrease the number of metadata entries in the remapper table.
3. Execute the Check Duplicate Dependencies rule in the Addressables Analyze window to identify and remove redundant metadata.
4. Enable Catalog Compression in your AddressableAssetSettings to minimize the runtime memory footprint of your addressable assets catalog.

Additional Tips

• Use the Memory Profiler package to inspect the Other category, where remapper allocations are typically categorized, to track how the remapper reacts to different loading patterns.
• Be aware that the remapper may not immediately decommit memory back to the OS after assets are released; this is often intended behavior by the underlying allocator to prevent fragmented re-allocations.