Is Ganglia's RRD module a bottleneck?

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http://serverfault.com – I want to monitor a LOT of metrics on a lot of machines, and from Graphite website, I noticed that ganglia's RRD compoent probably impose scalability issue from the following FAQ explaining why whisper got invented in the first place. If the problem has not been addressed (I like ganglia2's webapp), I wonder if there is a way to use gweb2 to read whisper data. "The second reason whisper was written is performance. RRDtool is very fast, in fact it is much faster than whisper. But the problem with RRD (at the time whisper was written) was that RRD only allows you to insert a single value into a (HowTos)