EDS Australia is working its assets, and perhaps its people, harder as the firm adjusts to the loss of a chunk of revenue from its key customer, Commonwealth Bank.Abbreviated financial statements provided at a media briefing on Friday shows a rise of 53 per cent in profit before tax, to $40 million in the year to December 2007 and a slight decline in revenue, to $1.17 billion.During 2007 Commonwealth Bank spent $100 million less with EDS than the year before. Revenue from the bank provided EDS with 32 per cent of its revenue in 2007, down from 41 per cent a year before.Mortgage processing provided a growing slice of the revenue pie. EDS said it processes around 20 per cent of Australian mortgages for Westpac and BankWest.A reduction of $20 million in the depreciation and amortisation expense, to $98 million, explains the higher profit in the face of lower revenues.Chad Barton, chief financial officer Australia and New Zealand said, "We are not extending the life of our assets per se, it's how we are redeploying them as we are going on."Essentially, Barton is saying the more effective your assets, the less assets you require. Therefore, less depreciation."We are actually finding that a dollar we may have spent in 2005, is currently buying us more storage and capacity and power in 2007 and beyond."Profit increase attributable to tighter cost control is unsustainable, with Barton adding, "I am not expecting any large reduction in depreciation over the next year," so future profit increases will have to come from the old method of increasing revenue.Employee-related costs are similar to 2006, with occupancy, administrative and computer-related expenses flat. Australia and New Zealand staff numbers shrank five per cent for the year to 7000.