A semi-batch process for the production of low molecular weight polyoxyalkylene polyols which have hydroxyl numbers of from 200 mgKOH/g to 500 mgKOH/g, comprising: establishing a mixture of a double metal cyanide catalyst and an initial starter in a reactor; activating said double metal cyanide catalyst with a first alkylene oxide block that comprises from 50% to 100% by weight of propylene oxide and 0% to 50% by weight of ethylene oxide, wherein the sum of the % by weight of propylene oxide and the % by weight of ethylene oxide totals 100% by weight of said first alkylene oxide block; adding a second alkylene oxide block into the reactor, wherein said second alkylene oxide block comprises from 50% to 100% by weight of propylene oxide and 0% to 50% by weight of ethylene oxide, wherein the sum of the % by weight of propylene oxide and the % by weight of ethylene oxide totals 100% by weight of said second alkylene oxide block; continuously introducing one or more starters into the reactor; optionally, adding a third alkylene oxide block into the reactor, wherein said third alkylene oxide block comprises from 95% to 100% by weight of propylene oxide and from 5% to 0% by weight of ethylene oxide, wherein the sum of the % by weight of propylene oxide and the % by weight of ethylene oxide totals 100% by weight of the third alkylene oxide block; oxyalkylating the starters to form the low molecular weight polyoxyalkylene polyols; and completing the addition of the second alkylene oxide block which was started in, and, when present, of the third alkylene oxide block, with a space time yield of greater than or equal to 250 kg/m 3 /hr; wherein the hydroxyl number was determined according to ASTM D4274-16. establishing a mixture of a double metal cyanide catalyst and an initial starter in a reactor; activating said double metal cyanide catalyst with a first alkylene oxide block that comprises from 50% to 100% by weight of propylene oxide and 0% to 50% by weight of ethylene oxide, wherein the sum of the % by weight of propylene oxide and the % by weight of ethylene oxide totals 100% by weight of said first alkylene oxide block; adding a second alkylene oxide block into the reactor, wherein said second alkylene oxide block comprises from 50% to 100% by weight of propylene oxide and 0% to 50% by weight of ethylene oxide, wherein the sum of the % by weight of propylene oxide and the % by weight of ethylene oxide totals 100% by weight of said second alkylene oxide block; continuously introducing one or more starters into the reactor; optionally, adding a third alkylene oxide block into the reactor, wherein said third alkylene oxide block comprises from 95% to 100% by weight of propylene oxide and from 5% to 0% by weight of ethylene oxide, wherein the sum of the % by weight of propylene oxide and the % by weight of ethylene oxide totals 100% by weight of the third alkylene oxide block; oxyalkylating the starters to form the low molecular weight polyoxyalkylene polyols; and completing the addition of the second alkylene oxide block which was started in, and, when present, of the third alkylene oxide block, with a space time yield of greater than or equal to 250 kg/m 3 /hr;