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Currently each PlanetLab landmark sends a total of 10 ping probes, if we reduce tis number to 5 then this might reduce the time to half. (NOTE : We tried changing the number of pings of PlanetLab from 10 to 5 but it didn't improve the speed)
Reflector.cgi
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)
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