On waking my Oct 2010 MacBook Air from sleep, it takes up to 20 seconds for the cursor to become useable and the computer to respond. The display comes on straight away, but I just can't do anything. I've tried a clean install of Lion and updating to current version through software update, but it still does this. Any ideas? New to owning an Air so not sure if this is expected with the SSD/lack of ram etc, though i wouldn't have thought so.