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this CheckLosFN is called for quite a few things including aggro, friendly faction (mobs), spell casting, auto attack, etc. It would be possible to build it over time but difficult to consume large amounts of memory.

As you mentioned it would seem costly for a cleanup and I don't think that you would see the accumulation (we try to start re-using id's once we get up to 1500 in the Entity class).

If anything -- it becoming a problem id say just every 5 minutes or something clear the map (dont bother checking the cache entries just flush it).