Efficient Buildings is a technology in Clone Campaigns that can be researched at the Power Core in Tech Level 4. It costs 350 Nova, and lets buildings create units and research technologies 10% faster. In addition, Power Droids move 10% faster.
This technology is useful for all players and all civilizations. It's expensive, but valuable if the player can afford it.
"In Tech Level 4, you may research Efficient Buildings at your Power Cores, which causes powered buildings to operate more efficiently than before. Construction of units, research of new technology, and other such actions will be conducted faster once Efficient Buildings has been researched."