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Reflector is the script responsible for calling all the landmarks to ping a target. It uses parallel UA to call upon 20 landmarks at a time for speed improvement. (NOTE: Increasing the number of parallel landmark calls to 80 even doesn't improve speed, this doesn't make sense)
Landmark Selection
Response speed should be an additional factor when deciding which landmarks to be kept active and which to be disabled. Only fastest landmarks should be considered for tier 0 selection. The landmarks that take too long to respond should be disabled as long as we have additional landmarks nearby.