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Usually to save time you increase cost, or to save cost you increase time. But it depends on what you mean by reducing time - do you mean construction time, or time to go from raw product to finished building?
Compressed Earth Block (CEB) is a modern refinement of the more traditional adobe earth block system, and some CEB systems, once you have the blocks, can be used to very quickly build a house. One system I have been especially impressed by now use the name StarTop (startop@blockprasan.com) the company is based in Thailand. The biggest catch with this type of system is that it is really important to get the foundation flat - because the system doesn't use mortar, so there is no room for error.