[DavidGruzman]

I would expect about order of magnitude speed difference between interpreted language and optimized machine code. I can recall case when reducing analytical request from 10 hours to 10 minutes changes the qualities of research company was doing - since analysts where able to do more queries selecting better dataset for the report. Order of magnitude response time might also be go/no go for interactive analytics. In case of clouds where we can assume infinite resources it can mean 1/10 of cost. For the private clusters - it can be differenace in buying 10 machines (something common in hadoop's word) and buying 100 machines - something very few groups can get.