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Your observation is correct. We took the dap2 code from OPeNDAP.org many years ago and have known about this dual copy problem for a long time. Until recently, this has been only a mild problem because very large data requests thru DAP2 were uncommon. It is unlikely that we will attempt to improve the code because it would be a large undertaking and we do not wish to devote the necessary the resources to do it. Instead, we have been focusing on the DAP4 protocol in Thredds version 5. This was designed from the start to be single copy. It takes the data directly from the underlying source and converts and transmits it only once. =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: EDH-245819 Department: Support THREDDS Priority: Normal Status: Open =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.