I think map caching should be implemented asap, before 4.0. I don't think it's too hard to implement.
Implementation:
When game starts, it should get sizes of all maps in bytes. Then if host sends the map which is same size, game should calculate some checksum of the file (md5 probably) and compare it with the host's. If it's different, then map is downloaded from the host, in other case it will be taken from the cache. Maps should be downloaded to User\SavedLevels\Download folder.
Evol
supported this idea
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I think map caching should be implemented asap, before 4.0. I don't think it's too hard to implement.
Implementation:
When game starts, it should get sizes of all maps in bytes. Then if host sends the map which is same size, game should calculate some checksum of the file (md5 probably) and compare it with the host's. If it's different, then map is downloaded from the host, in other case it will be taken from the cache. Maps should be downloaded to User\SavedLevels\Download folder.