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In page Turbomolecular pump:
"Much of recent turbo pump development has been focused on improvement of the effectiveness of the drag stages. As gas is removed from a pumped space, the lighter gases hydrogen and helium become a larger proportion of the remaining gas load. In recent years it has been demonstrated that the precise design of the surface geometry of the drag stages can have a marked effect on pumping of these light gases, improving compression ratios by up to two orders of magnitude for given pumping volume.[citation needed] As a result, it is possible to use much smaller backing pumps than would be required by pure turbomolecular pumps and/or design more compact turbomolecular pumps.
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